Valencia coach Koeman: Chelsea can win Champions League
"I think they are one of the candidates certainly, and since they changed the manager it's not made any difference," Koeman said of the Blues.
"They are a strong side full of top quality players. They work hard and have some excellent individuals who can turn a game and be decisive. The heart of the team is the midfield; they are tough and get stuck in. They are the heart and lungs of the side."