I was also surprised by how well these two teams did in the Europa League, especially compared to how they did in the Premier League.
I'm looking forward to the match between United and Lyon and as a United fan, I hope they will win but I don’t have the psychology to be so arrogant, the club has the mentality of a wet dishcloth. United should just be ready to fight for every game as it comes
As for the match between Tottenham and Frankfurt, IMO it is 50/50, especially after Frankfurt's last match. The penalty shootout will decide the final result.
The unpredictability that comes with supporting Manchester United can actually be humbling and I understand it clearly when you mentioned that you don't have the psychology to be arrogant about the team as they may disappoint later. It even feels like Manchester United and the spurs appears to be suffering same fate, you cannot bank on the spurs aswell both in the Premier League and in the Europa, it's been a season of too many uncertainties for both team but let's keep our fingers crossed as see what they have got with the europa while hoping for the best.
I don't know about Man U, because Lyon is not a very strong opponent and Man U will probably beat them and get to the next round, but Spurs, as I think, have no chance against Eintracht... Although in football there are often surprises and you can't be sure about any team, but English clubs do play very badly...