Arsenal have failed in their attempts to get Eddie Nketiah's red card against Leicester overturned or his ban reduced.
The England U21 striker will now face a three-game suspension after he received a straight red card for a late challenge on James Justin, shortly after coming on as a second-half substitute in the 1-1 draw at the Emirates on Wednesday.
Nketiah's will miss matches against Tottenham and Liverpool, as well as next week's FA Cup semi-final against Manchester City.
Arsenal head coach Mikel Arteta was incensed by the dismissal, particularly as Leicester striker Jamie Vardy had earlier escaped sanction after catching Shkodran Mustafi with a flailing boot before going on to net a late equaliser for the Foxes nine minutes after Nketiah's red card.
Speaking after the draw, Arteta said: "With the red card decision, he doesn't see the player and you have to know that he is a young kid.
Nketiah, who was on loan at Leeds earlier this season, has played a part in all of Arsenal's Premier League games since the restart and opened the scoring in last month's 2-0 win over Southampton.
Source: sky sport