Everything you need to know as Leeds United take on Middlesbrough

Leeds United travel to Middlesbrough on Friday night in a Championship crunch clash under the lights.
Samuel Saiz takes on Stewart Downing at Elland Road earlier this season.Samuel Saiz takes on Stewart Downing at Elland Road earlier this season.
Samuel Saiz takes on Stewart Downing at Elland Road earlier this season.

We've got your essential guide as the Whites travel north to take on Tony Pulis' men...