Boro find themselves in the thick of the transfer gossip at the moment as the Djed Spence saga continues.
The future of Spence may determine how much Boro boss Chris Wilder can spend this summer as speculation linking the defender with a move to Tottenham Hotspur or Nottingham Forest continues.
Boro themselves have already been linked with several players this summer including Premier League youngsters Cameron Archer and Aji Alese.
Boss Wilder is believed to be interested in bringing in a goalkeeper this summer as well as strengthening his attacking options but what free agents should the Teessiders be considering?
As players up and down the country get set for their release from clubs at the end of the month, we look at some of those heading out of contract who could be of interest to Boro this summer.
13. Lewis Grabban
Grabban remains in talks with Nottingham Forest over a new deal following their promotion to the Premier League. Should no deal be reached however, the 34-year-old would still represent an interesting option in front of goal having scored 13 times last season. (Photo by Jacques Feeney/Getty Images) Photo: Jacques Feeney