Jamie Shackleton has officially brought his 17-year stay at Leeds United to an end. Shackleton has put pen-to-paper on a three-year-deal with Sheffield United after rejecting the offer of an extension at Elland Road. Daniel Farke had been keen for Shackleton to stay at Leeds but his lack of game time last season has played a major part in his decision to leave, with his last league start coming in October. The 24-year-old is a product of the Leeds academy and had been at the club since the age of seven, aside from a one-year spell out on loan at Millwall during the 2022/23 campaign. He fulfill…