Valencia are reportedly facing the possibility of being without key centre-back Aymen Abdennour for Sunday's La Liga clash against Athletic Bilbao.
The Moroccan international is believed to have suffered a hamstring injury in Tuesday's Champions League clash against Lyon, a game that Valencia won 1-0 courtesy of a first-half strike from Sofiane Feghouli.
According to Super Deporte, the 26-year-old will undergo tests later this week to determine the extent of the damage, but is unlikely to make the fixture against Bilbao.
Abdennour signed a five-year deal with Valencia in the summer after turning down a host of other interest to make the move to Spain from Monaco.
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