Inter Milan star Xherdan Shaqiri made an instant impact for his new side in his first European game for them since signing in January.
The Switzerland international scored after just four minutes against Celtic, to quieten a raucous Parkhead crowd with a crucial away goal.
Shaqiri signed from Bayern Munich in the transfer window, having failed to hold down a regular starting place at the German champions, with the promise of becoming the main man for the Italians.
His addition however was bad news for Arsenal loanee Lukas Podolski, who had earlier agreed a deal to sign with Roberto Mancini's team until the end of the 2014/15 season.
Inter were only permitted by UEFA to register one player who had played Champions League football earlier in the campaign, and Podolski lost out, as reported by ESPN.
Given Shaqiri's permanent status this was perhaps not totally surprising, but all the same he instantly confirmed it as the right decision by opening the scoring against Celtic.
Podolski is yet to score in seven appearances and five starts for Inter, while Shaqiri now has three goals and two assists.
Celtic fought back from two goals down, before again coming back to draw the game 3-3 with a late equaliser from John Guidetti.