Joe Hart knows time is no longer on his side - which is why the Celtic goalkeeper is desperate to learn everything he can under Ange Postecoglou.
The Hoops boss picked England's former number one off the Tottenham bench last summer and backed him to show the form that saw him claim Premier League glory with Manchester City earlier in his career, and two more trophies were added to Hart's glittering silverware cabinet as Premiership and League Cup crowns were claimed.
Postecoglou's non-stop mantra was a big plus for the 35-year-old after a tough few years following his exit from City. Turning 36 this season, Hart is well aware that there's only so long he will be able to carry on for. It's fuelling his desire to help his team claim more success as pre-season gets underway for the new campaign, telling Celtic TV: "I don't think we can get away from the fact that the only reason we had success last year was because we were united.
