Chelsea and Tottenham Hotspur have been alerted after Axel Witsel hinted that he could leave Zenit St Petersburg in the summer, according to reports from the Evening Standard.
The 27-year-old will enter the final year of his contract with the Russian giants during the summer and is now believed to be considering his options.
Both the Blues and Tottenham were trying to lure the midfielder to their respective sides during the January window, but formal negotiations failed to take place.
Spurs were previously hoping to sign him for £17million, with Zenit previously placing a £25million valuation on the player following interest from AC Milan last summer.
Witsel admitted that he is ready to make a move to a bigger league, while adding that there are no ongoing talks with the club over any sort of extension.
“I still have a contract for one more year come June and the club know how I feel. I would like to play in a bigger league,” he told La Derniere Heure.
“I cannot say that I will 100 per cent leave, but we have not held talks over a new deal and my intention is to leave this summer.
“I want to focus on finishing the season on a high, then there’s the Euros and then we will see what happens.”
The Belgium international has already featured 31 times in all competitions for his side this term, so far managing to score four goals while providing another four assists.