Manchester United captain Roy Keane has been handed a one-match ban by Uefa for his sending off against Porto.
The Irishman was red carded during United's 2-1 Champions League defeat in Portugal on 25 February.
Keane was automatically banned for the second leg of the Porto tie because of his dismissal.
But now Uefa has decided not to hand the midfielder any further punishment so he would be available for the quarter-finals, should United qualify.
Keane was shown the 11th red card of his United career for standing on Vitor Baia as the keeper beat him to a long ball.
United boss Sir Alex Ferguson dismissed the incident, which sparked a furious touchline argument with opposite number Jose Mourinho.