Los Angeles Rams receiver Cooper Kupp suffered an MCL sprain on Sunday and "could miss some time," a source told ESPN's Adam Schefter.
Kupp was carted off the field in the first half of the Rams' victory over the Denver Broncos when safety Darian Stewart tackled him by the horse collar.
After evaluation, Kupp started the second half but only played one series after the training staff determined it was in his best interest to sit out.
Kupp said after the game that he was "feeling all right" but was "a little stiff.