Everton boss Ronald Koeman says they must deepen his squad this summer.

Koeman says his current focus is bulking up his squad for a Europa League campaign to come.

“My focus is to improve the team," he said. “We will see if there is really interest in those players, they will knock on the door and they will speak to the board of the club and if that happens then we will speak to each other about the situation.

“I think first of all we need more numbers in to be prepared for a long, tough season with different competitions.

“We need some more aggression in the team but the big point is to get in players who have more productivity.

“That's what we try to find, but it's not so easy but I am really hopeful that that aspect we can change for next season."