Mourinho did at least steer United to runners-up spot behind a peerless Manchester City in the Premier League but Conte's Chelsea trailed in fifth and defeat in what is expected to be his final game in charge would be a bitter pill for the Italian.
The Brazilian has had another good season for the Londoners and Chelsea fans, who face a very real prospect of losing Eden Hazard over the summer, will not want to see another one of their stars line out for Jose's United.
But Cahill has defended Chelsea's decision to sell the striker, suggesting he may not have been given the chance to reach his full potential at Stamford Bridge.
Willian's current Chelsea contract runs until 2020 but at the age of 29 his value is likely to dwindle dramatically as that deadline approaches, meaning that the Blues may seek to offload him now for a high fee and spend the money on younger talent. Naturally some progress and some don't, but you don't hear about the ones that don't.
"It's hard to do that". They've gone on and developed elsewhere, and he's gone on to be a top player. There's loads of them.
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"I was here when we won the Premier League and League Cup in 2015, but this time I would feel more of a part of it because I've been playing regularly".
"What I will miss the most is 3 o'clock on a Saturday", he said, "when I've got a microphone in my hand and I've got 90 minutes of football and intense concentration ahead of me".
"But we're back in another final and I'm looking forward to it".
We'll be honest with this one - you would be doing EXTREMELY well to get all three. We have to put that away and focus on the cup final this week.
"We don't have to think about next season, we need to win now, Saturday", he said. Let us know in the comments section below.
Lukaku is battling to shake off an ankle injury but is expected to be available for the final. We expect nothing less. This game has so much at stakes for both the teams.