With the job not yet complete, the boss could opt to pick a similar line-up to the one that triumphed 4-1 in the first leg, but with a healthy advantage in the tie, there is also a case for making some changes ahead of another important cup fixture at the weekend.
Casemiro, however, will serve the first game of his four-match domestic suspension during Sunday’s FA Cup quarter-final against Fulham, posing the question of if he will start Thursday’s match in Spain – given he’s unavailable at the weekend – or if Erik will play a midfield pairing that he plans to start together during the games that the Brazilian misses.