Arsene Wenger admitted Arsenal were at fault for Alexis Sanchez reportedly missing a drugs test as he completed his move to Manchester United but said the club have "nothing to hide".
Reports surfaced on Thursday evening that the Chile forward had fallen foul of the Football Association’s ’whereabouts’ rule by allegedly not being present for a routine doping test on Monday.
Sanchez was putting the final touches on his move to United, which saw Henrikh Mkhitaryan join Arsenal in an exchange deal, and an initial report from Spain highlighted the error.
Sanchez was still registered an Arsenal player when the apparent infraction occurred and Wenger conceded the club must take responsibility for the issue.
"It is just a bad day for him to be tested," he said.
"Honestly, on the administration side it would still be our responsibility because he had not moved.
"The intention of Alexis was not to hide - and we have nothing to hide.
"On Monday there was a lot going on, it is a special day for Alexis Sanchez - you have do paperwork and travel."