Manchester United are one of the leading clubs on alert after Milos Krasic opened the door to a summer move.
The Serbian winger is coming to the end of his contract at club side CSKA Moscow, and Manchester United are one of three or four clubs believed to be tracking Krasic with the intention of making a free move in the transfer window.
The 24-year-old has admitted that he will make a decision on his future before the start of the World Cup, dropping some heavy hints over a possible move away from Russia.
"For now I'm still a CSKA player and I haven't signed for anybody yet," Krasic told Sportski Zurnal.
"I have a lot of interesting options so I will make my mind up before World Cup. I would like to travel to South Africa with nothing on my mind."
Real Madrid, AC Milan, Bayern Munich and Liverpool are all reportedly interested in the former Vojvodina star, although Krasic appears to have his heart set on a move to one of three clubs.
"Real Madrid - it is by far the biggest club in the world and anybody would love to play in the white shirt. But also playing for AC Milan and Manchester United would be dreams come true."
Krasic is expected to be one of the stars for Serbia in the World Cup, scoring twice in the qualifying campaign.
It's his delivery and set-up play that has caught the eye of some of the best sides in Europe however, and the possibility of a free move will almost certainly lead to a battle for his signature over the coming months.