Ahead of his side's FA Cup tie against Manchester United at Ewood Park on Sunday, Blackburn Rovers boss Owen Coyle believes Nigerian international Hope Akpan should not face further punishment following his dismissal against Sheffield Wednesday.Akpan was dismissed for pushing referee Scott Duncan and has since been charged with violent conduct by the FA. READ MORE: Super Eagles midfielder gets three-match banWith Blackburn 2-1 down towards the end of the game, Akpan put the ball into the back of the net, as he thought he had earned a point for his side. He was however disappointed when referee Duncan ruled out the goal for handball, and his reaction which has been played down by Coyle was adjudged to have been an assault on the referee who promptly showed the Nigerian a red card. "Hope Akpan did not shove the referee. If you look he has his hands outstretched and is saying he scored a perfectly good goal. READ MORE: Super Eagles midfielder sent off after pushing referee"We accept that you cannot touch the referee and a three-match ban is fair enough but to add to that in my opinion would be wrong." Coyle is quoted as saying on BBC SportsThe out of favour Super Eagles midfielder was on Thursday handed a three-match ban following his sending off on Monday.