Chelsea goalkeeper Petr Cech goes into their clash with Manchester United having studied up on Wayne Rooney.
Cech admits he will spend long hours studying Rooney's goals.
He said: "Every time I play I watch videos of opposition goals. I've been doing it all my career and the only difference this time is the video will be a bit longer than normal!
"You can see there are similarities in the movement when he scores. The main target is to see everybody's movement - so you know when the cross is coming where people should be.
It gives you an extra second and you can deal with it. That's the reason I study it."
