Arsenal right-back Hector Bellerin returned to full training on Friday after recovering from the head injury he sustained against Chelsea, meaning he could play against Hull on Saturday.
Bellerin was pictured taking part in Arsenal's training session at London Colney after being cleared by club doctors following a week of going through the Football Association's protocol for concussions.
Manager Arsene Wenger had said on Thursday that he wouldn't know until Friday whether "he gets the green light from the medical people to practise or not."
Bellerin had to be substituted after the opening goal of Chelsea's 3-1 win on Saturday, after he took an elbow to the face from Marcos Alonso and then landed hard on the pitch.
But his quick recovery will be a boost to Arsenal as they enter a crucial week that also sees them play Bayern Munich in the Champions League on Wednesday followed by an FA Cup game at Sutton United.
However, Mathieu Debuchy also took part in full training and is fully fit again after a hamstring injury, meaning Wenger could afford to rest Bellerin against Hull to keep him fresh for Bayern.
Mohamed Elneny is also back for Arsenal after his stint at the African Nations Cup with Egypt, giving Wenger more options in central midfield in the absence of Santi Cazorla, Aaron Ramsey and Granit Xhaka.