The last time Aguero played this season after being out for a while, he was so sharp and I think he even scored a “fox in the box” type of goal. I think it was in a league cup match.Tempting though it is, I wouldn't start him at Anfield. Have him on the bench. A sort of "in emergency, break glass" scenario. And don't bring him to Turf Moor at all. He wouldn't be ready to play any part there after only a couple of days' training.
Midfielders and maybe Foden have been bailing our rather unsharp attack for quite some time now. Get Kun on the pitch for 20 - 30 mins vs Burnley and then have him start against the dippers. We can always bring him out if we need to add some steel as the game wears out.