Law was joined at the service by Sir Bobby Charlton and Sir Alex Ferguson, who were quoted earlier in the week when it was announced that Gregg - a hero of the Munich Air Disaster - had sadly passed away at the age of 87.
“Harry was the most wonderful guy and one of the best goalkeepers of all time, he was fantastic,”
Law told club media, during a museum event to mark the 110th anniversary of Old Trafford.
Gregg and Law shared a dressing room for four years from the latter's arrival in 1962, and together the pair helped United to win the FA Cup in 1963 and the league title in 1965.