The Boston Celtics signed forward Ryan Kelly and waived forward Ben Bentil on Friday.The term of Kelly's contract were not announced per team policy.Kelly, 25, was drafted with the No. 48 overall pick in the 2013 draft by the Los Angeles Lakers. He spent his first three seasons in the league with Los Angeles, averaging 6.5 points, 3.3 rebounds and 1.4 assists over 20.5 minutes a night in 147 games (59 starts). Kelly played six preseason games with the Atlanta Hawks this fall, posting averages of 4.8 points, 2.7 boards and 1.3 assists over 15.0 minutes per contest. He was released by the Hawks on Tuesday.Bentil, drafted with the No. 51 overall pick by the Celtics in this year's draft, isn't expected to join their NBA Development League affiliate Maine Red Claws despite earlier consideration to do so."I think that Ben will look for other opportunities," Celtics president of basketball operations Danny Ainge told reporters Friday."We are just so loaded at that position with Jaylen (Brown) and Jae Crowder and Kelly Olynyk and Al Horford. We have a lot of guys that play the 4 position. I think that he probably wants to look for somewhere that might have more of an opportunity."Bentil, 21, played two seasons at Providence College. As a sophomore last year, the Ghanaian averaged 21.1 points, 7.7 rebounds and 1.0 blocks on a Friars team that reached the second round of the NCAA Tournament.He was named the Big East Conference's Most Improved Player and was an All-Big East first-teamer.Bentil averaged 5.0 points and 4.3 rebounds in 12.9 minutes per game in three preseason games with Boston.The Celtics still need to cut two more players ahead of next Wednesday's season opener against the Brooklyn Nets.