The Cincinnati Bengals could be without wide receiver AJ Green for their wild card play-off with Indianapolis Colts on Sunday due to concussion.
Green was forced from the field with four minutes to play in Sunday's 27-17 defeat to the Pittsburgh Steelers after a heavy collision with Steelers safety Mike Mitchell.
The hit forced Green to fumble what would have been a 17-yard gain, with the Steelers soon after launching a drive that resulted in a 63-yard touchdown for Antonio Brown to effectively settle the contest.
Defeat saw Marvin Lewis' side lose out on the AFC North divisional title to the Steelers, but could come at a further cost if Green is forced to sit out Sunday's clash with the AFC South-leading Colts as the Bengals go in search of a first post-season win since 1990.
Four-time Pro Bowl-choice Green will have to prove his gradual return to fitness in the week, per the NFL's concussion protocol.
Green has made 69 receptions for 1,041 yards and six touchdowns this year, though his link-up play with quarterback Andy Dalton has struggled in comparison to recent seasons.
Lewis will be desperate to have one of his key offensive weapons on the field, as the Bengals look to avenge October's 27-0 washout at Lucas Oil Stadium, when the visit Indiana again at the weekend.
Pittsburgh saw 2014 MVP Le'Veon Bell depart the game at Heinz Field with a painful-looking knee injury.
However, with the Steelers set to tackle the Baltimore Ravens in the weekend's wildcard action, coach Mike Tomlin delivered positive news on the running-back's fitness.
He said: "Structurally it appears to be fine so we"ll see if he'll be available to us here in our next game.
"We'll gather more significant information as we proceed through the week. No journey is without its adversity. We're thankful that it"s not anything major."