Chelsea hero Ruud Gullit is convinced by the value of Diego Costa.

The Chelsea striker was on target yesterday as Antonio Conte’s men swept aside Southampton 2-0 at St Mary’s.

“His work rate opens spaces for you,” Gullit said.

“When you’re a striker, you know that if he goes right, you go left because all the attention goes to him.

“He’s a handful and I’d like to play with a player like this.”