The top five clubs in the Premier League currently are Everton, Arsenal, Manchester City, Chelsea and Liverpool.
It's almost certain that these will be the final top five at the end of the season (although probably in a different order).
So, to improve their good form over the next season, who must they buy in the summer? And for how much?
Romelu Lukaku: £22m
Chelsea are looking for a world class striker, and with Everton seemingly destined to qualify for Europe, Romelu Lukaku seems inclined to stay at Goodison Park.
Everton need a striker to become a fantastic side, and Lukaku would fill the hole. The price isn't cheap, but Lukaku is worth it.
Gareth Barry: £4m
Another out-of-favour loanee that Everton must sign. Barry has been outstanding in defensive midfield this season, Manchester City do not want him.
Mario Mandzukic: £20m
Although valued at £26.5m, Arsenal should be able to sign Mandzukic for a reduced price given that Robert Lewandowski is coming to take his place.
Mandzukic is exactly what Arsenal need: a consistent, prolific goalscorer. He may also gel well into Arsenal's style of passing football as he has worked with it at Bayern.
Hakan Calhanoglu: £6m
I know that he won't break into the first-team squad immediately, but Wenger is good at signing young stars and turning them into world class players. And a boy of Calhanoglu's potential, available for such a small price, is really good business. He could just be the next big thing.
Alex Song: £8m
Another player Arsenal may sign at a small price. Song left Arsenal for Barcelona two years ago, but has failed to make the grade. Although valued at £16m, his lack of game time means that Arsenal may well get him for a small price.
Eliaquim Mangala: £20m
Manchester City have a brilliant squad, and only a couple of flaws that need to be dealt with if they are ever going to win the quadruple. One is in defence: Vincent Kompany may be highly capable, but alternative partners Martin Demichelis, Joleon Lescott and Matija Nastasic (as of yet at least) are not.
One player linked with Manchester City is Eliaquim Mangala, who is clearly too good for Porto and is likely to join in the summer.
Fraser Forster: £4m
Manchester City need a decent goalkeeper, and one fantastic 'keeper available for a modest sum is Celtic's Fraser Forster. Could he be signing of the season?
Luka Shaw: £11.5m
You have to feel for Luke Shaw: so much pressure on his shoulders! He has become a great overlapping full back with a decent cross on him, and this is exactly what Manchester City need.
Jackson Martinez: £26.5m
Before I say why they should sign Martinez, I'll say why they shouldn't sign Cavani, Falcao or Costa. This is because of their history. Think of Andrei Shevchenko, Fernando Torres, Ricardo Quaresma and Adrian Mutu. All washout signings having had big money spent on them.
This will happen if Chelsea spend masses on expensive strikers. Mark my words. Instead they should sign Jackson Martinez, who could just solve their lack of a striker.
Raphael Varane: £21m
Chelsea sometimes lack composure in defence, and Raphael Varane has proven himself to be a world class defender, although he can't get into the Real Madrid team. He has worked under Jose before, so could that motivate him?
Cheikhou Kouyate: £6m
Never heard of him? He's a centre-back who plays for Anderlecht, but his defensive qualities have attracted attention. Liverpool need a great defender: could he solve their problems?
Ashley Cole: £5m
It's a shame what's happened to Ashley Cole. At the beginning of the season he was one of the best full-backs in the world, now he seems to be on the way out of the Premier League.
However, there is one good team that could offer him a contract: Liverpool, as they are in need of a left-back.
Xherdan Shaqiri: £17.5m
Having been one of the most promising young midfielders in the world, Shaqiri has failed to shine at Bayern. He's a fantastic winger with exploitable potential, and Liverpool are currently at a loss for a winger. He would be a fantastic signing for Brendan Rogers.
Dani Parejo: £8.8m
Liverpool may have a strike force to end all strike forces and two superb attacking midfielders in Philipe Coutinho and Jordan Henderson, but what they really need is a slightly more central midfielder.
One good idea is Valencia CF's Dani Parejo, a young star who seems destined to make it at the top who could just complete Liverpool's midfield.
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