Yes, the FA Cup trophy was the reason why Erik Ten Hag was given another opportunity to remain as Manchester United's head coach because Manchester United's management believes Erik Ten Hag would turn things around in Manchester United this season. But from what Erik Ten Hag has shown in the Premier League so far, it seems like Erik Ten Hag would not live up to the expectations of Manchester United management. If Erik Ten Hag fails to deliver a convincing win against Southampton this weekend, his job will be at risk.
If it is a real reason for that big decision, it's hilarious as FA Cup trophy is not comparable to Europa League trophy that won by Mourinho. Mourinho was fired while Ten Hag with poorer performances, less valuable trophy was kept, this decision is a big joke. Ten Hag was very lucky to get this hilarious support from Manchester United, and it looks like an unconditional support for him. It's big different support from Manchester United compared to what Mourinho received seasons ago. They sacked Mourinho, because they wanted to keep Paul Pogba in their club and after several years, we saw what they got with Pogba, nothing considerable.
The club will definitely be very disappointed with their choice to keep Ten Hag just because they succeeded in making Man United win the FA Cup after Man United lost their good position in the Premier League. But winning against Southampton won't be difficult for this team.
Tasks for Ten Hag in this season can be top four in Premier League and as far adventure as possible in Europa League. Chance for them to win Europa League trophy is very small if not say nearly impossible. Top four in Premier League can be impossible for them to if they continue with similar bad performances like early matches so far.