Chelsea boss Thomas Tuchel has given fans an update on the fitness of one key player ahead of the match against Leeds United this lunch-time.Under the German, the Blues have not tasted defeat and have claimed wins over Tottenham, Liverpool and Atletico Madrid.When he took over from Frank Lampard, the west London club were ninth in the Premier League.They now sit fourth and have an excellent chance to finish in a Champions League spot - though West Ham are chasing them down.A win over Leeds would help keep the Hammers at bay for a whole longer, though they are two points behind with a game in hand.One of the major changes Tuchel brought in was a formation change that saw Chelsea revert to a three-at-the-back system that worked under Antonio.
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