Liverpool manager Jurgen Klopp has said that his players will need to help centre-back Joel Matip in marking Chelsea striker Diego Costa during the Premier League clash between the two clubs on Friday night.

The Chelsea striker has been in impressive form so far this season, scoring four goals in four league appearances, and will be looking to add to his tally when the Reds visit Stamford Bridge.

However, Klopp feels it will be a team effort, rather than the sole objective of Matip, to keep the Spaniard quiet.

Klopp said: "Hopefully he doesn't play alone against him. You have to work together.

"You cannot defend Costa alone. That's not possible. What does the centre-half do when the No9 drops into midfield all the time? Go with him and leave a gap open for [Eden] Hazard? That's not how defending works. You need help from the other six, the other four, whatever.

"After the game if we said Matip had a problem with Costa, then we had 10 other problems because that cannot be the plan.

"Joel has been good. I would say he's still not at 100 per cent fitness because he had a difficult pre-season. He couldn't train for a spell and for a tall guy like this fitness is a very decisive thing.

"Now you can see he is a really smooth player, he's flexible and in a very good way."