Liverpool and Chelsea have 12 days to trigger Timo Werner's €52m (£49m) release clause at RB Leipzig.
The German has been prolific this season and has been linked with a move away from the Bundesliga outfit.
His release clause of £49m expires on June 15 though and will make securing a deal more difficult.
Werner is keen on a switch to the Premier League with Liverpool the front runners, but they are not prepared to pay the fee given their current financial situation.
The 24-year-old is keen to join a team in the Champions League with Chelsea and Manchester United also making contact with the player, reports Sky Sports.
Leipzig tied Werner down to a new deal last summer that runs until 2023, but the release clause allows for an early exit should it be activated.
A 32-goal campaign is the German's best return in a single season with 25 of those coming in the Bundesliga.
Leipzig boss Julian Nagelsmann recently admitted that Werner's exploits will open doors for him and is aware that he could look elsewhere.
“He is in a good mood, feels good and trains well,” the Leipzig boss told SportBild.
“I do not have the impression that he is carrying a large cross with him. But he is a young guy who is sure to sit at home with his wife and ponder whether he will stay or change.
“When the question is in the room, you are always a little bit somewhere else. It was no different for me than when in Hoffenheim, it was about whether I go away.
“It is more obvious with strikers, because then there are phases in which they do not score.”