will look vastly different from in Bilbao when they travel to in the on Sunday. is set to prioritise keeping his players fresh ahead of Thursday's second leg at Old Trafford despite over Athletic Club.
United's Premier League season is a write-off, and rotation has been standard in recent weeks as the focus shifts towards Europe. Amorim is desperate to avoid unnecessary injuries and fatigue after insisting the Red Devils' semi-final tie isn't over.
Express Sport attempts to nail down the visitors' likely lineup at the Gtech Community Stadium...
Man Utd predicted XI vs Brentford (3-4-3)Goalkeeper: Bayindir
Andre Onana had a breather in between United's two meetings with Lyon, so Amorim could be tempted to hand Altay Bayindir another chance in similar circumstances.
Defence: Fredericson, Lindelof, Shaw
Tyler Fredricson was a surprise debutant and earned mass plaudits for his performance against Wolves in April.
With Leny Yoro and Harry Maguire crucial to United's defence, both could sit out the Brentford match, opening the door for Fredricson's next opportunity.
Matthijs de Ligt's return to the pitch off the bench in Bilbao was a positive step towards the likely destination that is the Dutchman joining Maguire and Yoro in the back line.
If that's the way Amorim goes in the second leg, Victor Lindelof could keep his place on Sunday.
Luke Shaw is in line for back-to-back Premier League starts after getting 20 more minutes in the legs in Bilbao.

Midfield: Kamason, Mainoo, Ugarte, Amass
Amorim described Noussair Mazraoui as "dead" after Thursday's win, and that could signal a debut for right-back Jaydan Kamason.
The 18-year-old is a natural full-back but has flaunted his attacking qualities in the youth system and could fit the 3-4-3 system used by the first team.
Harry Amass is likely to receive his latest start on the left, with Amorim also pinpointing Patrick Dorgu as a fatigued player on Thursday night.
Manuel Ugarte left the pitch after 65 minutes against Athletic, which may have afforded enough rest to partner Kobbie Mainoo in midfield at the weekend.
Attack: Garnacho, Mount, Hojlund
Alejandro Garnacho is an important cog in the Europa League-chasing machine but he has been regularly starting games for weeks.
Amorim has often pointed out the fact that the Argentine is one of his only direct attackers, which could see him get the nod over Christian Eriksen.
Mason Mount will hope he gets a rare start in United's attack, with Rasmus Hojlund looking to build on a positive first-leg showing up front.
Chido Obi is another young player on the brink of a maiden start, though, and Sunday could be his moment if Amorim opts to rest Hojlund.
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