The on-field antics of Vancouver Whitecaps midfielder Barry Robson are making MLS headlines.

The former Celtic man admits he's a 'grump' on the pitch.

"I'm just grumpy on the pitch because I want to win football matches," the 33-year-old Robson told the Windsor Star. "I'm only joking. I was just having a laugh. I just want to win football matches, that's the main thing."