Borussia Dortmund coach Lucien Favre recognises there is no guarantee over the futures of Jadon Sancho and Achraf Hakimi.
Former Manchester City winger Sancho has long been linked with a return to the Premier League, most persistently with Manchester United.
Hakimi's future is also unclear given his loan deal from Real Madrid expires at the end of the season and Dortmund have not yet agreed to an extension.
Editors' Picks
Although the impact of the coronavirus pandemic has made significant transfer spending less likely across Europe, it remains unclear whether Dortmund will be able to keep Hakimi and resist offers for Sancho.