Level 4.
I chose a very defensive tactic 3W-2N-3W-1-1 vs. his 4-4-1-1, which should be ok. But my mistake was the mentality, I chose normal instead of defensive like in the 1st leg (rest remained the same: long balls, force counters, normal tackling). So he came threw too easily and scored after some minutes. And before I adjusted the tactics he came threw another time and my LB saw red after he fouled him in the box (0-2 penalty, 12th). Finally I then adjusted to defensive mentality, subbed in a LB for the ML, and moved my DC/DMC to DC, so new tactics 4-DMC-MC-MC-MR-AMC-ST. Before the half-time whistle my AMC (not well covered) made the 1-2, which would have been the next round. But in the second half he brought fresh player, made the 3-1, controlled the match with a 4-1-4-1 (seems to be his favorite system) and could even use a counter to win 4-1.
Attachment 4911
That is dissapointing after the 2-0 away win, but I learnt the hard way that defensive mentality is vital against much stronger teams.