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Boateng is not a natural attacking midfielder. He's best suited for a box-to-box role where his strength and energy can be properly utilized.
That being said, Allegri has constantly experimented with Boateng, fielding him in a number of positions last season including trequartista, winger and central midfielder.
The Ghanaian international struggled with consistency last term. After scoring nine goals in 27 matches in the 2011-12 season, Boateng's scoring numbers dropped considerably, netting just three goals in 37 matches. Some of that inconsistency has to in part be attributed to the incessant positional changes, but even so, he didn't impress last season.
He has a flair for the fantastic and can score some amazing goals, some of which can be seen here.
He's a decent passer who will look to play an incisive through ball to the forwards, a requisite ability for a trequartista. He can generate tremendous power on his shot. The pockets of space he'll find around the edge of the 18, behind Balotelli and El Shaarawy, will be good shooting areas for the dynamic midfielder.
Linked with a move away from the San Siro after that poor season by ESPN FC, Milan could expect to get up to €15 million (transfermarkt) for Boateng, should he be sold.
If Boateng stays with the Rossoneri, Allegri would be wise utilize him as one of the three central midfielders in the 4-3-1-2. A consistent role could do him a world of good, and his athleticism would be vital for the Milan midfield.
He's included in this list because of Allegri's decisions to use him at the position in the past, but should the Italian tactician field him out of his natural position again, his poor form from the 2012-13 season could continue.