It’s that time of the year again. As the nights grow longer and (slightly) warmer, the transfer window kicks into gear and Premier League clubs search high and low for the very best additions to their squads.

After a truly underwhelming season which saw them finish in the bottom half of the table for just the second time in ten years, a new revolution has blossomed at Everton.

An outgoing Roberto Martinez has been replaced by the incoming Ronald Koeman; a serious managerial upgrade in anyone’s estimations.

With such a disappointing campaign in 2015/16, the new man at the helm will likely demand a serious re-shuffle of the playing squad.

Here are three players who look set to leave Everton this summer, plus three potential new arrivals...

IN – Vincent Aboubakar

Vincent Aboubakar (Cameroon)

Tall, strong, powerful, great finisher, good in the air – sound familiar?

At just 24, Vincent Aboubakar has already established himself as a clinical goal scorer and has been in fine form for Porto, scoring nearly a goal every two games in the famous blue and white.

Rumours are circulating that the Cameroon international is being lined up for a move to Goodison Park. Whether this is as a replacement for Romelu Lukaku or not remains to be seen.

IN – Jasper Cillessen

Netherlands v Chile - FIFA World Cup Brazil 2014 - Group B

A man who Manchester United were rumoured to be interested in last summer, Jasper Cillessen could well be the man Everton choose to replace Tim Howard, who is heading Stateside after 13 years away from home.

The 27-year-old is in the form of his career, starting every game for both club and country and is bound to work well with Koeman, a legendary figure in the Netherlands.

Should the keeper settle on Merseyside, he could well be first choice between the posts for the next decade.

IN - Virgil Van Dijk

Virgil van Dijk (centre)

A revelation at Southampton last season, Virgil Van Dijk has a number of reported suitors, who are looking for a no-nonsense, ambitious and tactically astute centre-half.

Signed by Koeman from Celtic last summer, the Dutchman is rumoured to be keen on a move to Everton, especially as his former manager has offered him first team football at Goodison Park.

However, it is expected that any move for Van Dijk would hinge on whether John Stones remains a Blue or not.

OUT – John Stones

John Stones

This transfer saga has been rumbling on so long, even John Stones must be fed up of hearing about the future of John Stones.

However, with such a dramatic change in management within the Premier League elite club, it is expected that one of the new men will make a serious move for the best young centre-half in England.

Early reports suggest that both Manchester clubs are the front runners for Stones’ signature.

OUT – Romelu Lukaku

Romelu Lukaku

There is no hiding the fact that Romelu Lukaku wants out of Everton. Before the European Championships, his father and agent confirmed his son’s desire to look for a new employer.

At just 23, Lukaku has a potentially lucrative career ahead of him and there will be no shortage of European clubs ready to compete for his signature.

Everton may find it tough to replace the young Belgian’s goal tally and will likely hold out for a considerable transfer sum before letting him leave.

OUT – Kevin Mirallas

Kevin Mirallas Everton dejected

Frustrated by a lack of playing time at Goodison Park, Kevin Mirallas almost left Everton earlier this year, after purported interest from Monaco and West Ham.

Despite his obvious talent, Mirallas has always remained a controversial figure on Merseyside, with his frequent tantrums and inconstancy.

If Ronald Koeman cannot guarantee first team football, it is likely that the Belgian will move on to pastures new.