The Red Devils played out a 2-2 draw against Les Gones in the first leg of the Europa League quarter-final last week.
They have everything to play for in the second leg at Old Trafford. Ahead of the game, Amorim has provided a big update.
Onana was rested for the 4-1 league defeat at Newcastle United last weekend, but he is expected to return tomorrow.
Altay Bayindir made his league debut for the Red Devils on Sunday, but it was a forgettable experience for the 27-year-old.
Bayindir was nervous with his distribution and made a high-profile error which contributed to the Magpies' fourth goal.
This has left Amorim with an easy decision to make on Onana.
Onana's future still remains in the balance and there is speculation that United could replace him at the end of the season.
He has been linked with a move to the Saudi Pro League.