Former Celtic striker, John Hartson, believes that Liel Abada might need to leave Celtic after the Israeli winger suffers from a drop in form. Earlier today we told how Charlie Mulgrew gave Abada some advice on how to try and save his Celtic career. But Hartson now believes that the time is coming for Abada to leave Celtic if he’s not going to feature in the first team anytime soon. Hartson said [The Go Radio Football Show], “There’s no doubt about it, the lad looks devoid of confidence. He’s a shadow in terms of the player that he was when he first arrived. “Him and Jota were outstanding toge…