Manchester United legend Roy Keane wants former club teammate Nicky Butt as his assistant if he's appointed as the permanent manager at Scottish Premiership giants Celtic. This is according to the report from The Sun. It was revealed that Nicky Butt will be the assistant to Roy Keane if the former Manchester United skipper is appointed as the man to replace Neil Lennon as the permanent manager at Celtic.Neil Lennon was the Celtic manager until the former club player resigned from the position some weeks ago. Another ex-Celtic player in John Kennedy has been placed in temporary charge of the team until the end of the current campaign.