Arsenal manager Arsene Wenger has let Andre Santos know that swapping shirts with Robin van Persie midway through Saturday's defeat to Manchester United was unacceptable.

The Brazilian left-back was team-mates with Van Persie until the striker's acrimonious departure to Old Trafford during the summer. Santos endured a torrid time against United and also came under scrutiny for exchanging shirts with the Holland international at half-time of a game in which Arsenal slumped to a 2-1 defeat.

Reports suggested Santos could be dropped from Tuesday's Champions League tie at Schalke as a result but, while angry with the left-back, Wenger was keen to downplay the incident. "I spoke about that but I don't want to make too much of a big story of that," the Arsenal boss said.

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