Celtic crashed out of the Champions League after a 3-2 aggregate defeat against AEK Athens.
Rodgers’ men lost the second leg 2-1 last night after drawing 1-1 at home.
Popular pundit and former Celtic striker Chris Sutton believes that the Scottish champions should now look to invest in the squad if they want to succeed.
He said to BT Sport: “They have spent £2m on disco lights at Celtic Park for Champions League nights! Invest in the playing squad!”
Last night, Brendan Rodgers hinted that the lack of signings has hurt the team and the fans are already calling for investment before the window closes.