Sanchez failed to inform drugs testers of his whereabouts on Monday, as his transfer from Arsenal to Manchester United was pushed through.
UK Anti-Doping officers were unable to locate him despite a trip to Arsenal's training ground, and on Friday Arsene Wenger admitted Arsenal should bear responsibility for not informing the authorities the Chile forward would not be at the club's Colney base.
READ MORE: Arsene Wenger admits Arsenal to blame for Alexis Sanchez missed drugs test on day of Man United move
Sanchez laid on two goals on his United debut as Mourinho's side overwhelmed Yeovil 4-0 at Huish Park on Friday night to move into the FA Cup fifth round, before Mourinho insisted the drugs test issue was an honest mix-up.