Freddie Ljungberg has joined Arsenal for preseason.
The Sun says the two-time title winner played the role of referee at a session at San Jose State University.
The former Swedish international is currently coaching the Arsenal Under-15s, but was on hand to offer his words of wisdom to Arsene Wenger.
The 39-year-old was spotted taking some time out from officiating as he sat down with Jack Wilshere, with the two talking tactics.
Arsenal are preparing to take on an MLS All-Stars team today (Thursday), which could see the Premier League outfit come up against some familiar faces.