Yaya Toure is Manchester City's driving force in midfield, the man who makes them tick and a real difference maker.
We saw in the early part of the year how City's away form suffered without him when he was on African Nations Cup duty, and with another tournament scheduled for 2013, City will have to cope better, and may have to make signings to do so.
He stepped up in a must-win game for City at the end of the season against Newcastle to score two vital goals when the game was in deadlock.
Rivals Manchester United have struggled in their match-ups against him, whether it be Anderson or Paul Scholes, Toure has been dominant.
In fact there are very few midfielders in the Premier League that have come out on top against Toure, such is his imposing physical presence and athletic ability.
One man who has performed well is Belgian midfielder Fellaini, who like Toure is a tall athletic midfielder who has the skill and composure to go with it.
Everton have had a good success rate against City in recent matches, and Fellaini has played a key part in that.
Now there is talk of him moving on with a big money move to Chelsea, who could link him up with fellow Belgians, Hazard, De Bruyne and Lukaku.
If Chelsea do make a bid for Fellaini- expected to be valued between £20-25 million, City should think about matching it.
Chelsea are building a squad they hope will be capable of battling for the title, City's title- Fellaini could be a difference maker and energise their midfield.
Instead of allowing a rival to catch up, City should move to sign the Belgian and move further ahead of the pack themselves.
The 24-year-old has a big future ahead of him, if he takes the ambitious step to move on and the big money bids come in.
City are reported to be willing to let Nigel de Jong go, and with Hargreaves released and Pizarro's loan not extended, there is space in the squad for an extra midfielder.
Imagine a pairing of Fellaini and Toure- Would there be a more imposing central midfield duo in the Premier League?
Could you find a better pair to match them? It would be a real challenge. With the both of them City could continue to dominate physically and skilfully in the centre of the park, and give their more creative players extra freedom.
City could afford to play the both of them even in a 4-4-2 in a number of games, allowing plenty of chances for City's array of striking talent to shine. The impact of Toure leaving for the African Nations Cup would also decrease. If City are serious about retaining their title, they need to move forward and improve, not stand still.
They may decide not to go for it, and Fellaini may even stay at Everton, but if City really want to progress and evolve, the midfielder would be a solid addition, and a proven quantity in the Premier League.
Should City go for Fellaini? How would he improve the team?
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