The next fixture is indeed a bit harder for Milan but I guess Liverpool will loosen up something to give some starting eleven players a rest. With the perfect points they got so far, Liverpool has the discretion to give their substitute players a chance to show up.
I hope they didn't, Liverpool is still on fire, when they loosen up the games it could be affected for another game in the premier league. I hope Klopp doesn't change the formation within the full team like usual, Salah still has a chance to create a new record in the champions league. Right now, Salah is the top score in the champions league but it is possible he will defeat Lewandowski with 8 goals. While Milan, only miracle to bring the team to 2nd round, only if Porto vs Atletico ties.