Celtic crashed out of the Champions League after a disappointing performance against Cluj last night.
Former Celtic star Charlie Nicholas has urged the club to improve on their goalkeeping options this summer.
Nicholas wants his former side to sign Fraser Forster or Joe Lewis before the window closes.
He said: “Neil Lennon needs to make a goalkeeper his number one signing priority. If I were the Celtic manager, I would be doing all I could to get Fraser Forster back to the club. We saw further evidence of the need for the goalkeeping position to be urgently addressed at Motherwell.