Chelsea welcome German giants Bayern Munich to Stamford Bridge on Tuesday in a mouthwatering Champions League last-16 first-leg tie.
These are the games that Frank Lampard will really find out if he can cut it as a top-level manager and he has a number of big calls to make.
From choices over formation to who he picks up front and which Bayern players to target, here are the key tactical issues Lampard has to get right if the Blues are to take a lead over to Allianz Arena next month.