Paul McCallum signed a two-year deal with Leyton Orient in June 2015 following his release from West Ham United.
McCallum started his career at Dulwich Hamlet and it was back in October 2010 that the forward made his first team debut for the club at the age of 17.
The forward played an integral role for the youth team that season as they reached the third round of the FA Youth Cup where they faced Newcastle United having defeated Yeovil Town in the previous round.
His performances attracted interest from a number of Premier League sides and on January 31 2011, McCallum made the decision to sign a professional contract with West Ham United.
McCallum was unable to make the breakthrough at West Ham however during his three years at the club as he was loaned out on several occasions to Rochdale, AFC Wimbledon, Aldershot Town, Torquay United, Heart of Midlothian before a spell at Portsmouth during the 2014-15 campaign.
The striker enjoyed a promising start to the 2015-16 season with three goals in his first five Orient matches, though his season was halted after suffering a knee ligament injury in the 1-1 draw at Northampton Town on September 26. McCallum was to make his comeback on the final day of the season however, coming on as a substitute in the 1-0 victory at Yeovil Town.