Derby's Jeff Hendrick in action with Hull's Abel Hernandez
Boro have already swooped to land defender Bernardo Espinosa and winger Viktor Fischer, but manager Aitor Karanka may still be in the market for new signings ahead of his side's return to the Premier League.
Adding quality in midfield appears to be a priority for Karanka, given that he only has Grant Leadbitter, Adam Clayton and Adam Forshaw as his central midfield options - and a raid for a Euro 2016 star could be on the cards.
The Sun report that Boro have set their sights on Derby County ace Jeff Hendrick, who enjoyed a superb Euro 2016 campaign with the Republic of Ireland.
Hendrick, 24, has come up through the ranks at Derby since signing from St Kevin's Boys in 2008, has made more than 200 appearances for the Rams and now established himself as a vital member of the Republic of Ireland national team.
The midfielder was Ireland's star man in France this summer, putting in consistently excellent performances for Martin O'Neill's side having shown tenacity as well as quality on the ball.
Now, it's claimed that Derby are willing to cash in on Hendrick as they have plenty of midfielders in the ranks, and are hoping for something of a bidding war between two Premier League newboys.
Middlesbrough and Burnley are both believed to plotting moves to sign Hendrick, but having starred at Euro 2016, it would be little surprise to see other Premier League sides register an interest this summer.
Would you like to see Boro sign Hendrick?