GLASGOW (AFP) Celtic, still reeling from Saturdays humiliating Scottish Cup exit to First Division Ross County, have the chance to bounce back when Motherwell visit Parkhead on Tuesday. The Hoops crashed to one of their worst ever defeats when their lower league opponents dished out a giant-killing performance at Hampden in the cup semi-finals. The defeat, Celtics 14th of the season, seriously dented the chances of caretaker manager Neil Lennon landing the role on a full-time basis in the summer. Rangers are 13 points clear at the top of the Scottish Premier League and any slip-up from Celtic against Motherwell could see their Old Firm rivals crowned champions at Tannadice on Wednesday. In-form Dundee United are also breathing down the necks of the Parkhead side, trailing them by just five points in the race for second place and a potential spot in the Champions League qualifiers. Lennon, a former Celtic captain, has challenged his players not to hand Rangers the title on a plate. As a player you have to have it in you to want to bounce back after humiliating results, said Lennon. You have to take the bad with the good and the humiliation that comes with it. Its being able to pick yourself up again and show a bit of bottle. The interim manager said he would recommend to the board a summer clearout of the current players whether he remained at the helm or not. And he urged disgruntled supporters to continue to back his side despite admitting some of his players were unworthy of their loyalty.