Robbie Savage on Arsenal's Andre Santos shirt swap 'shocker'

Robbie Savage answers the best of your tweets each week in Savage Says.

This week's subjects include Celtic's 2-1 win over Barcelona and Arsenal defender Andre Santos's controversial shirt swap with Manchester United's Robin van Persie as the two players left the Old Trafford pitch at half-time.

You can send Robbie your questions each week via Twitter by using #savagesays