Middlesbrough have made their third signing of the summer with the transfer of Marten De Roon from Atalanta.
The 25-year-old Dutch defensive midfielder has moved to Teesside for an undisclosed fee.
De Roon moved to Serie A last season from Heerenveen, playing all but two matches for the Bergamo side.
Middlesbrough's pre-season training began this week ahead of their first friendly, at York City on 9 July.
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