Mets manager Terry Collins expects Jason Bay (concussion) to be out longer than seven days.

"I don't know how long it's going to be, but my guess is that it'll certainly take a little bit of time," Collins said. "We're just going to bide our time and see how he comes out here in the next few days and see how he feels." Bay suffered his second concussion in less than two years Friday and was placed on the 7-day DL. The Mets activated Justin Turner to replace him on the roster.

Jason Bay is in the Mets' lineup Friday.

Bay was activated from the DL Wednesday, but this will be his first start after a sinus infection and an adverse reaction to an antibiotics knocked him out the last two days. He was batting .240/.316/.460 with three homers and five RBI in 57 plate appearances prior to suffering a non-displaced fractured rib while attempting to make a diving catch on April 23.

Jason Bay was scratched from Thursday's game against the Nationals due to flu-like symptoms.

Scott Hairston will play left field and bat sixth. Bay hasn't appeared in a major league game since April 23. He was activated from the disabled list Wednesday but has battling an illness for most of this week.

Jason Bay (rib) is expected to return from the disabled list Wednesday.

Bay, who had his return pushed back due to illness, went 0-for-3 with a walk while playing left field Tuesday in a rehab game with High-A St. Lucie. The 33-year-old has been sidelined since April 23 with a non-displaced fractured rib, but he's expected to reclaim his starting left field job. It's not clear who he'll replace on the active roster.

Adam Rubin of ESPN New York reports that Jason Bay (rib) will play left field for High-A St. Lucie on Tuesday.

Bay was originally expected to be activated for Tuesday's series opener against the Nationals, but he was scratched from Monday's rehab game due to illness. Out since April 23 with a non-displaced fractured rib, Bay is expected to rejoin the Mets later this week.

Updating a previous item, Jason Bay will not return from the disabled list Tuesday.

Bay was originally expected to be activated for Tuesday's series opener against the Nationals, but he was scratched from his rehab game Monday due to illness. Look for him to rejoin the Mets later this week.

Updating a previous item, Jason Bay (rib) is expected to be activated from the disabled list Tuesday.

Manager Terry Collins confirmed Jason Bay (rib) is on track to return to the Mets on Friday.

If all goes as planned, Bay will be used as the designated hitter during interleague games this weekend. The 33-year-old has been out since April 23 with a non-displaced fractured rib. He is expected to play left field for High-A St. Lucie on Monday.

Adam Rubin of ESPN New York reports that Jason Bay (rib) will begin a minor league rehab assignment Saturday with High-A St. Lucie.

Bay, who is currently working his way back from a non-displaced fractured rib, has been playing in extended spring training games this week. Barring any setbacks, the 33-year-old should be ready to rejoin the Mets as a DH next weekend against the Yankees.

Mets general manager Sandy Alderson indicated Friday that Jason Bay (rib) could return from the disabled list within a week.

Bay has served as the DH in extended spring training games this week and is likely close to going out on a rehab assignment. The veteran outfielder has been sidelined since suffering a non-displaced fractured rib on April 23. He's expected to get his starting left field job back upon his return.

Jason Bay (rib) served as the designated hitter Monday in an extended spring training game.

While he hasn't played the field yet, it shouldn't be much longer before he's ready to begin an official minor league rehab assignment. Barring any setbacks, Bay should return in the next 10 days or so.

Mets manager Terry Collins hopes that Jason Bay (rib) will be ready to DH in rehab games next week.

Bay is currently working his way back from a non-displaced rib fracture. He was recently cleared to increase baseball activities and was slated to take batting practice Wednesday in Florida. He's likely around 10 days to two weeks away from rejoin the Mets.

Jason Bay (rib) is scheduled to travel to Florida on Monday to continue baseball activities.

Bay, who is currently rehabbing a non-displaced rib fracture, is scheduled to begin taking batting practice off coaches on Wednesday. He is expected to be eased into action as DH in rehab games before playing the field. He's likely two weeks away from rejoining the Mets.

Jason Bay (rib) plans to take batting practice Monday.

Bay hit off a tee Sunday. It's encouraging that he is progressing this quickly following a non-displaced fracture of a rib on the left side. ESPN New York speculates that Bay could return in one week.

Jason Bay (rib) is scheduled to hit off a tee Sunday.

The Mets will request permission from team doctors for Bay to begin taking light batting practice on Monday, but it's not yet known when he'll be cleared to return. If all goes well, he could rejoin the team in early-June.

Jason Bay (rib) has begun running and playing catch.

He's still in the early stages of his return to baseball-related activities following a non-displaced fracture of a rib on the left side. Hitting will likely be the most difficult task, and it's not clear when he'll be allowed to do that. Bay is hoping to return before the end of the month.

Mets manager Terry Collins indicated Tuesday that Jason Bay (rib) will get his starting left field job back when he returns from the disabled list.

"Absolutely," said Collins. "He didn't come here to be an extra player." Bay was recently cleared for baseball activities, but is likely about 10 days to two weeks away from coming off the disabled list. We think a platoon with rookie Kirk Nieuwenhuis is inevitable, but the Mets will at least give Bay an opportunity to keep his job. The 33-year-old was hitting .240 with three homers and a .776 OPS over his first 50 at-bats prior to suffering a non-displaced fractured rib on April 23.

Jason Bay (rib) has been cleared to resume baseball activities.

Bay will resume baseball activities Tuesday and is expected to travel to the team's complex in Port St. Lucie, Florida this weekend. He'll start out with a running program before progressing to other activities, but he's currently aiming to return by the end of the month. Kirk Nieuwenhuis and Scott Hairston will continue to share playing time in left field for now.

Jason Bay (rib) is aiming to return to the Mets by the end of May.

Bay, who estimates that his rib is 80 percent healed, was examined by a team doctor Monday and hoped to be cleared to begin baseball activities in the near future. "When I first did it, everything bothered me," Bay said. "Now, all the day-to-day stuff doesn't bother me." Bay will first begin a running program before progressing to other activities.

Jason Bay (rib) has yet to be cleared to resume baseball-related activities.

He's evidently still feeling pain in a rib on his left side where he suffered a non-displaced fracture. Bay has already been on the disabled list for nearly a week and is eligible to return in mid-May, but it's sounding like he might not be ready then.