Jose Mourinho says his Manchester United players will be fully prepared for the "quality and speed in attack" that FC Rostov possess.
The Reds boss and his coaching staff have spent time analysing Thursday's Europa League opposition and Mourinho has pinpointed the Russians' counter-attacking ability, while admitting the poor state of the pitch at Olimp-2 may force him to adapt his approach.
"This is a very difficult game. But this is the first leg and we have the second leg to play at home. I am not sure what the game can be, I am not sure we can play the football we are used to playing; maybe we have to try to adapt to a different game-plan," he told MUTV.