The one and two thing is completely irrelevant. Doesn’t matter.
If you look, us and united are in one semi, Spurs and City the other. The Premier League will have cleared all of this already with UEFA. Have a look when City, Spurs and United all play. City 12.30 Saturday and Spurs 8pm
Monday, so if Spurs win they’ll swap. If we play United and City get knocked out, they aren’t going to move us both to Saturday, move Spurs to Sunday and City to Monday. Far too much messing.
Worth remembering that it doesn’t matter at all which way round the semis are to UEFA.