By Jude Summerfield Gareth Southgate was among the attendees of a 60th birthday meal held for Sir Dave Brailsford, according to a report. England boss Southgate has been linked with the Manchester United job in recent weeks, with Brailsford now in a key position at Old Trafford as director of Ineos Sport. The former defender brushed off the speculation in the March international break, during which he oversaw a defeat to Brazil and a late draw with Belgium, and The Telegraph claim Southgate was joined at the dinner party by Sir Alex Ferguson, Arsene Wenger, Roy Hodgson, Mauricio Pochettino, Th…