Dennis Cirkin is a free agent this summer after his departure from Sunderland. He is considered a suitable player for Middlesbrough, but would not be an inexpensive signing despite being out of contract. A signing-on fee would be required, and he has been on Premier League wages for the last season following Sunderland's promotion. His injury record is also a factor for consideration.

Dennis Cirkin, who has both English and Latvian citizenship, is set to leave Sunderland when his contract expires and is expected to be able to choose from a number of Championship clubs this summer. Middlesbrough could view the 24-year-old as a potential left-back alternative, particularly as Matt Targett, who is departing Newcastle United, will have many options. Cirkin is regarded as a player with a range of skills with attacking intent and defensive abilities that could make him a suitable choice for manager Kim Hellberg, and he is also seen as having the potential to develop further. The defender, who joined Sunderland in August 2021, made 8 appearances in the Premier League during the 2025/2026 season. According to Transfermarkt, he has a current market value of €6.00m.