Don't see Klopp rotating heavily. Will want to maintain the momentum and match sharpness. Guess he will bring in Gomez and Moreno. Whoever is intended to partner VVD against Man Utd will need to have played at least one of the games against Newcastle or Porto. So perhaps Matip against Newcastle and Lovren against both Porto and Man Utd.
In terms of the front 3, guessing all 3 to start and 2 of the three to be yanked after 60 mins. We have had a 10 day break and after Porto we have 1 game per week for the next 3 weeks. Quarters are in April.
Expect Porto to be a low intensity game and see how game progresses. Midfield will be rotated depending who wishes to start against United.
I'd be surprised if we started Salah and Firmino against Porto, and stunned if we started all 3. It would seem like an unnecessary risk to me. The tie is over, Porto aren't going to score 6. We don't want to lose in a way which derails form etc but we shouldn't need to play Salah and Firmino to beat Porto in any event.
I'd keep Karius in the team as he's unlikely to get injured and every game he plays gets him more entrenched. If Clyne is fit to start it's a good low pressure competitive game to give him a run out in. With no Moreno there's not much choice at LB, Robertson will start. Might see Gomez get a rare game at CB, and would expect him to play Lovren if he wants to play Matip and VVD against United. Again, why risk one of them taking a knock if they're our first choice pair for such an important game?
Injuries and fitness mean we can't rotate too much in midfield either. We don't have Grujic and I can't see him throwing Ejaria a game, so it's going to be three of Lallana/Milner/Hendo/Wijnaldum/Ox/Can. Hardly resting or playing a weakened team with any combination of them. I suspect we're likely to try to use our highest energy midfield against United (Wij, Ox, Can) so would have thought that fitness permitting we might see Hendo, Milner and Lallana against Porto.
Up top again we're not running over with options. I'd hope he'd rest Salah and Bobby, so play Mane with Solanke and Ings. Both the latter two would welcome a chance to impress and Solanke in particular badly needs a goal.
Rests TAA, VVD, Matip, Ox, Wij, Can, Salah and Firmino for the United game whilst still playing a very competitive side.
If we perform well and win, brilliant. If we don't it's not the end of the world, and frankly the players should be up for the united game whatever the outcome of this tie.