Middlesbrough have agreed a deal to sign Denmark winger Viktor Fischer from Ajax, the Teesside club have confirmed.

The 21-year-old will join Aitor Karanka's side, who have secured promotion to the Premier League for next season, for an undisclosed fee when the international transfer window re-opens on June 9.

Fischer has agreed a three-year deal at the Riverside and leaves Ajax having made over 100 senior appearances for the Amsterdammers.

He is Karanka's first signing of the close-season.