Difficult' Haaland transfer admission made by Borussia Dortmund amid Real Madrid and Manchester United talk

 CEO Hans-Joachim Watzke concedes retaining the services of the prolific Norwegian will be tough - but not impossible

Keeping Erling Haaland at Borussia Dortmund in 2022 "will be difficult" concedes club CEO Hans-Joachim Watzke, but the Bundesliga outfit are not giving up hope of repelling interest from Real Madrid and Manchester United.

A big-money move for the prolific Norwegian striker is expected, with his exploits in German football attracting admiration from leading sides across Europe.

Dortmund are aware retaining the services of a prized asset is going to be tough, but Watzke says there is no guarantee the 21-year-old will be lured to pastures new.