Seattle Seahawks quarterback Russell Wilson was forced off with a hand injury as his side went down 26-17 to the Los Angeles Rams on Thursday.
During the fourth quarter of the contest, Wilson sprained the middle finger on his throwing hand and had to be replaced by Geno Smith at the Lumen Field.
Following the home defeat, Seahawks coach Pete Carroll was unable to provide a timeframe on Wilson's return but hailed Smith for his impact in place of his injured teammate.
Carroll told reporters: "He's got a badly sprained finger that we need to figure out. I wouldn't put any timeline on it right now, There's work to be done in assessing all of that. Russell's one of the great healers of all time and he'll do whatever he can to get back as soon as absolutely possible.
"The other side of that, Geno did a really good job, very much in command, we were able to do all kinds of things with him out there. He handled all of the communications beautifully and played really well. We had a chance to win the football game with all of that."
Wilson has started every game of his professional career so far but is now highly uncertain for Sunday's clash with the Pittsburgh Steelers.