Greenhalgh, from Orpington, who played for the Welling United youth team, was featured in the Sky One show Football's Next Star and impressed judges in the trial game after laying on a perfect cross for Hicham Abdellah to head home.
[1] After 20,000 entries to the show and eight episodes, Greenhalgh was given the shirt and revealed as the winner of Football's Next Star 2010, receiving a professional six-month contract with Inter Milan.
[2] After his six-month professional contract at Inter Milan came to an end, Greenhalgh was offered another year from the Italian giants which included a four-month loan spell to Calcio Como, where he scored eight goals from 12 games.
After his contract was up, he returned to the UK and spent time at Brighton & Hove Albion,[4] as well as a spell at Birmingham City, where he was advised to play first team football in the Conference to gain experience in the English game.
He was immediately signed by National League South side Hemel Hempstead Town, who had Greenhalgh on loan towards the back end of the 2016–17 season.
[20] In December 2022, the sacking of Andy Drury saw Greenhalgh appointed joint-caretaker manager with fellow player Reece Prestedge.