Leeds United have been dealt a massive boost ahead of their clash with Manchester United after Stuart Dallas returned to first-team training.
The Northern Ireland international was last weekend forced to withdraw inside 10 minutes of their defeat against Everton after a coming together with Toffees attacker Alex Iwobi.
Dallas has been crucial to Bielsa's side and had been almost ever-present this season, playing all but 12 minutes of the campaign, before his early substitution at Goodison Park.