Alexis Sanchez's struggles at Manchester United have "no explanation", according to Ander Herrera, who says his old team-mate "had everything to succeed" at the club.
Sanchez joined United from Arsenal in a swap deal with Henrikh Mkhitaryan in January 2018, bringing to an end his hugely impressive four-year spell at Emirates Stadium.
The 31-year-old scored 80 goals in 166 appearances for the Gunners, becoming one of the finest imports in Premier League history in the process.
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He was, however, unable to reproduce the same electrifying form at Old Trafford, and ended up being shipped out to Inter on loan last summer after netting just five goals in 45 outings across all competitions.