The Blues have previously been linked with a move for the Belgian midfielder this summer, with Jose Mourinho sending scouts to watch him in action.
Arsenal and Atletico Madrid are both said to be interested, but Sport.be claims that Wolfsburg are now leading the race for Tielemans' signature.
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Wolfsburg splashed the cash to sign Kevin De Bruyne and Andre Schurrle from Chelsea
The German giants have some transfer history with the Blues, splashing the cash on Kevin De Bruyne and Andre Schurrle in the last two January transfer windows.
Jose Mourinho has already admitted that he would have preferred to keep the duo at Stamford Bridge, but that Wolfsburg's big-money bids were too good to turn down.
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