Hoomanawanui was injured in Sunday's 36-33 victory at Denver. He missed a month earlier in the season with a high sprain to his left ankle, and coach Steve Spagnuolo said Monday it's too early to say whether the rookie will have to go on injured reserve. Hoomanawanui also suffered a rib injury in the game.
Hoomanawanui, who hauled in a 36-yard touchdown pass from rookie quarterback Sam Bradford, has 13 catches for 146 yards and three touchdown on the season.
Bradford's touchdown tosses all went to tight ends in the Rams' win. Hoomanawanui rumbled into the end zone for his score after slipping by safety Brian Dawkins at the 13. Bill Bajema then scored his first two touchdowns of his six-year NFL career with catches of 2 and 26 yards, the latter when he was uncovered.
The Associated Press contributed to this report.