The PFA is concerned over how National League players are being treated.
The arrival of Erik ten Hag at Old Trafford in the summer saw the Portugal veteran's game time restricted and, as his unhappiness grew so did his frustration, which led to an unauthorised and explosive television interview with Piers Morgan in which he criticised the club.
San Marino sit in the familiar position of 211st and last in FIFAâs global rankings.