Later, after signing for another amateur team Retford Town, Belfitt turned professional in July 1963 and signeď for Leeds United.
An Inter-Cities Fairs Cup semi-final first-leg game against Kilmarnock saw Belfitt scoring three goals in the opening 30 minutes in a 4–2 victory.
The following season (1968–69) Leeds won the league title but Belfitt was restricted to eight appearances (two of which were as substitute) but his three goals secured vital victories against Ipswich Town and Sunderland.
He was dropped when Jones returned but following another injury a week later, Belfitt was not picked and promptly handed in a transfer request being signed by Bobby Robson at Ipswich Town for £55,000.
A ninth goal was scored in a 2–2 draw at Everton on 28 October impressing manager Harry Catterick to make an offer for the striker.
Within a year Belfitt was transfer listed and in November 1974 spent a brief period on loan at Fulham scoring a single goal in six games.
After playing amateur football for Worksop Town, Frickley Athletic and Bentley Victoria, Belfitt worked as a draughtsman and a financial adviser.