Oxford United have signed Birmingham City winger Siriki Dembele for an undisclosed fee.

The 27-year-old has agreed an undisclosed long-term contract at the Kassam Stadium and is the U’s 15th signing of the summer.

BBC Radio Oxford understands the fee breaks the club’s transfer record.

Dembele said: “I have played against Oxford a few times and it looks like an exciting time for the team, so that’s why I have signed and now I want to do something big with the club.”

He started his career at Grimsby Town and had spells at Peterborough United, Bournemouth and Auxerre before moving to Birmingham City.

Dembele scored six goals in 37 appearances for the Blues last season.

“We are delighted to have landed Siriki on a permanent contract as we continue to strengthen the team,” said head coach Des Buckingham.

“He is a player with proven quality at this level and above and his football style compliments our attacking play.

“Siriki is exactly the type of profile that we were looking to bring in at this stage of the window. He is a player that can come straight into the group and make a difference, and we are all excited to see him in action.”