Arsenal have been hit with a triple injury blow ahead of tomorrow’s Premier League match against Manchester United with doubts over the participation of Theo Walcott, Danny Welbeck and Alexis Sánchez.

Walcott is almost certainly out after returning from England duty with a groin problem, while Welbeck (hamstring) and Sánchez(fatigue) are also causing Arsène Wenger concern before his first meeting with Louis Van Gaal’s United.

Welbeck and Sánchez will be monitored closely in training today, with Wenger, the Arsenal manager, desperate to play both of them tomorrow.

Welbeck limped out of England’s 3-1 win over Scotland on Tuesday with a hamstring problem, but Sánchez only returned from international duty on Thursday evening and has yet to train with his team-mates. The Chile international played for