West Ham have been told it will cost them at least £35m to prise Youssef En-Nesyri out of Sevilla this month.
The Hammers have bid £22.5m rising to £27m for the Morocco striker, who is one of at least three forwards they have made offers for.
But Sevilla, who signed the 23-year-old from Leganes a year ago for £18m, want a bumper fee for their star striker.
En-Nesyri is under contract until 2025 and has eight goals in 17 games in La Liga this season as well as four in six Champions League games.
But Sevilla have yet to tell the Hammers he is not for sale and talks will continue this week over a possible move.
The Spanish side consider a fixed fee of around £31m as a starting point for negotiations, with the rest in add-ons.
But West Ham boss David Moyes insisted on Monday the club do not have “bundles of money” and that he wanted to “spend it wisely.”
He even claimed he would be willing to wait until the summer for the right player if a deal cannot be done this month at a reasonable price.
That would mean the Hammers finishing the season with Michail Antonio as their only recognised striker.
Whether they will increase their bid for En-Nesyri, who also has 11 goals in 35 games for his country, remains to be seen.
But they are also interested in Reims striker Boulaye Dia and Montpellier’s Gaetan Laborde.