Borussia Dortmund are fighting to keep hold of Erling Haaland away from Chelsea this summer.
Football Insider reports Dortmund do not want Chelsea to add Timo Werner into a deal to try and sign Haaland.
The Champions League holders are trying to bag the star striker this summer but Dortmund are reluctant to let him go.
Haaland has returned to pre-season training with the German club.
Chelsea have also offered Tammy Abraham and Callum Hudson-Odoi in negotiations for Haaland thus far.
