But manager Arsene Wenger refused to confirm if the player will make an appearance on Wednesday, despite concerning injuries of Mathieu Flamini and Mikel Arteta.
Wenger acknowledges title race wide open after Leicester win [AMBIENT]
"Coquelin is back training but we will see. Arteta and Flamini are not available," Wenger said.
Flamini (hamstring) and captain Arteta (dead leg) won't play, while forward Olivier Giroud must serve a one-match ban following his red card against Dinamo Zagreb. David Ospina could again come into goal.
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Defender Gabriel is available following a domestic suspension but Jack Wilshere (fibula), forward Danny Welbeck and Czech midfielder Tomas Rosicky (both knee) are also sidelined.