Leeds United have bid farewell to Elland Road stalwart Luke Ayling, who secured a loan switch to Middlesbrough on Wednesday. The Leeds veteran’s contract runs out at the end of the season, so he has likely played his last game for the Elland Road outfit. According to The Athletic, Leeds and Daniel Farke are said to have decided against offering Ayling a contract extension before Christmas. Ayling joined Leeds from Bristol City for £500,000 back in the summer of 2016, becoming one of the best bargains of all time for the Whites. The 32-year-old played for Leeds for seven-and-a-half years, clock…