Manchester United are said to have been given an ultimatum by Lazio over Mason Greenwood.
The forward is the subject of serious transfer interest from the Italian capital club.
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Per La Gazzetta dello Sport, United rejected Lazio's offer that came in at the start of June.
The Italian side put forward a bid that was worth £17m plus a 50% sell-on clause.
United want to sell the player as quickly as possible, ideally before pre-season training begins.
Lazio president Claudio Lotito is unwilling to budge on his valuation, which creates a problem, as United want nearly double that fee.