Dele Alli faces one of those defining nights in his career on Wednesday, but such is the unpredictability of the 21-year-old Tottenham midfielder that it really could end with his name in lights for all the wrong reasons as well as the right ones.
The fact that the visit of Real Madrid to Wembley represents Alli's entrance onto the Champions League stage this season is a direct result of the negative side of his game overshadowing the positive on his last appearance in European competition for Spurs.
Alli was hit with a three-match suspension by UEFA for a wild and reckless challenge on Gent midfielder Brecht Dejaegere, which earned the Spurs man a red card during the 3-2 Europa League defeat against the Belgian side in February.