Middlesbrough have completed the signing of Bristol City centre-back Aden Flint, it has been announced.Boro missed out on a swift Premier League return last season and have set about improving their squad as they attempt another tilt at promotion to the English top-flight. revealed GOAL: Sheffield United 1-2 #BristolCity, Flint 90. #SHUvBRC pic.twitter.com/3E9YGpcpEf— Bristol City FC (@BristolCity) December 8, 2017Bristol City’s chief executive officer Mark Ashton told the Robins’ official website: “There has been significant interest in Aden for a lengthy period and it’s the correct time in his career for him to move on.“We thank him for everything he has done during his time at the club and we wish him well in the future.” Why is VAR not being used for Play-Off Final between Aston Villa v Derby at Wembley? REVEALED Party Time must listen UNBELIEVABLE GIF Flint, 28, spent five years at Ashton Gate become a fan favourite thanks to his prolific goalscoring from defence, and his celebration GIFs on the Robins’ Twitter account.He has signed a four-year contract at the Riverside and moves for a fee in the region of £7million, and is their second signing of the summer after Paddy McNair. Leeds and Derby begin Championship season away – opening day fixtures in full FRANK ASSESSMENT Super Computer predicts where every Championship club will end the season ‘The Lampard effect’ – Derby fans love Chelsea legend after stunning goal CHARLIE WANTS BACK Aden Flint moves from Bristol City to Middlesbrough. Super computer predicts end of season Championship table SWEET HOME bold Revealed 1 ‘We’re dancing in the streets’ – Sunderland fans react to huge player news Latest Football League news How the Championship table would look based on every club’s home form only ‘Rules are laid down by the clubs’, insists EFL chief as Bury are expelled Stoke midfielder Charlie Adam ‘absolutely’ interested in Rangers return Why Bristol City selling Aden Flint is bad news for football fans Lee Johnson added: “On a personal level, it’s fantastic to have seen Aden mature and grow to become one of the best centre-halves in the division.“I am naturally disappointed to see him leave but it’s important we move forward.“I’m sure he will always receive a warm welcome at Ashton Gate and I look forward to seeing him when we face Middlesbrough next season.”talkSPORT will be with listeners all day and all night at this year’s 2018 FIFA World Cup™ with over 800 hours of World Cup content and all 64 games live across the talkSPORT network.