Cheikhou Kouyate, who was due to miss West Ham’s clash against Sunderland on Saturday, will now be eligible to play.
The powerhouse midfielder was sent off during the Irons’ 5-1 FA Cup romp against Blackburn and faced suspension after he collided with defender Adam Henley as they both chased the ball.
Co-chairman David Gold immediately confirmed the club would challenge referee Jon Moss’s red card and the appeal was upheld.
Despite West Ham’s FA Cup victory, which has ignited fans’ imaginations, West Ham have stuttered in recent games in the Premier League.
A win, a draw and a defeat in their last three games has made their sixth position look more vulnerable.
Saturday’s 12.45pm match will have added spice with the return to the Boleyn Ground of Big Sam Allardyce.
Despite guiding West Ham to the Premier League, the manager never enjoyed the full support of the terraces.
Club co-chairman David Sullivan said : “I have said it before that I felt he did a perfectly good job during his four-year spell. He did all we asked of him and I am a fan of Sam.
“He left the club in a considerably better state then when he arrived and, for that, the board were truly grateful.
“He took us back into the top flight with a memorable victory in the play-off final at Wembley and then managed to cement our position in the Premier League.
“I can’t criticise Sam because he did a good job and I like him. But I think from both sides it was time for a change.
“We made the decision to appoint Slaven Bilic during the summer and the club have now grown even stronger this season.”