Arsene Wenger admits allowing Alexis Sanchez to see out the final year of his contract could cost Arsenal as much as £140million.

The Gunners boss revealed the numbers involved if the Chile forward leaves at the end of the season as expected to Manchester City.

The Frenchman admits the Gunners will miss out on a fee of up to £70million should he depart in June – and will have to spend that much again to ensure he is adequately replaced.

"You take a Sanchez into the final year of his contract, you sacrifice £60-£70million income and at the end of the season you will have to buy somebody for that amount of money," Wenger told beIN Sports.

"It has a huge price so at some stage you have to make a decision; you have to sacrifice one or two."