The 30-year-old Chilean forward recently secured a season-long loan move to Inter Milan from Old Trafford. "I don't regret going there", he added.
If they (United) would let me play I'll do my best. "Sometimes I would play 60 minutes then I would not play the next game - and I did not know why".
It was a remarkable fall from grace for a player who scored a goal almost every two games (80 goals in 166) in 3½ seasons for Arsenal and 47 times in three years at Barcelona before that.
Ahead of his switch to Inter Milan, Sanchez was not listed for pre-season games and was also missing in Man United's first three Premier League fixtures of the 2019-20 campaign, with club boss Ole Gunnar Solskjaer citing an injury he suffered while on global duty.
However, he started just 31 of 77 games the Red Devils played during his time there and played the full 90 minutes on just 13 occasions. It was really hard for him.
Instead, United focused their attention on young, British talent even when it meant paying a premium for Premier League players such as the £80 million Leicester demanded for Harry Maguire or spending £50 million for 21-year-old Aaron Wan-Bissaka from Crystal Palace.
A year of regular first-team football can obviously do wonders for any players but the return of Alexis Sanchez will largely depend on one factor - Daniel James.
It will be genuinely intriguing to see how Sanchez fares at Inter Milan, to see whether whatever it is weighing the forward down - like a vehicle going at 50mph with its handbrake still on - derives from United or something deeper, something more indelible.
Meanwhile, Inter have confirmed Sanchez will wear the No. 7 shirt at the club this season.
"I felt fine", he said. "I think I did well in the Copa America".