After losing three players after the Nov. 29 loss at Cincinnati, the Browns added another in Sunday's loss to San Diego. Defensive lineman C.J. Mosley was placed on injured reserve Monday with a right ankle problem that may need surgery.
Mosley went down in the first quarter of the 30-23 loss to the Chargers and left the stadium on crutches afterward.
A five-year veteran who spent the previous three seasons with the New York Jets, Mosley started one game and played in 12 this season, finishing with 18 tackles.
To take his place, the Browns signed free agent defensive lineman Derreck Robinson. A University of Iowa product, Robinson played in 16 games with the Chargers in 2005-06 and in six games with Miami in 2007. In 2006, he saw action in 14 games and recorded 14 tackles, 1 1/2 sacks and three passes defensed.
He was out of football in 2008 and waived by Dallas on Sept. 5, 2009.