The list includes La Liga and Bundesliga stars
With Manchester United having thrown enough money at their attack to make it work again, they are now looking to move on and improve their defence.
The Red Devils have been linked to a number of top names over the last month, with moves looking likely to happen in both January and the summer.
Here are four of the most heavily linked players to Old Trafford…
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Aymeric Laporte, Athletic Bilbao
The French centre-back has been linked with the Old Trafford side by the Metro.
He would be available for £32 million pounds and at 20-years-old could be a long term option for the Red Devils. He would be an improvement on the current crop of centre-backs, with Phil Jones and Jonny Evans currently finding it hard to fit in to the new style of play being played by manager Louis van Gaal.
Ron Vlaar, Aston Villa
The Dutchman impressed at the World Cup, where he was working under the current Man Utd manager. He has since been rumoured to be a target.
At 29 he isn’t getting any younger, but he would be cheaper than the other choices. He would also be used to Louis van Gaal’s methods and management style.
Mats Hummels, Borussia Dortmund
The World Cup winner is apparently United’s number one transfer target, according to the Metro.
Another centre back who could come in to shore up the leaky defence, Hummels is also comfortable with the ball at his feet. This would make him perfect for the playing style van Gaal is enforcing. At 25, he would be another long term option, and the Old Trafford hierarchy are willing to part with up to £40 million to get their man.
Winston Reid, West Ham
The New Zealander has shot to prominence after playing a key part in Sam Allardyce’s West Ham revival. Due to this he has been linked to a number of clubs, including Manchester United.
With his current contract finishing at the end of the season and stalling on a new deal, the Hammers might be willing to let him go in January. However, they are still hopeful of getting him to sign on for a few more years before it come to that. Alongside Ron Vlaar, the 26-year-old could be another cheap option for the Red Devils.