You don't need to be quick to deal with Saka you just need to be good in your duels against him. Saka the last two games for Arsenal as an example Perraud for Saints, Cresswell for West Ham, Both not quick but both we're good in their 1 v 1 battles with Saka and he done fuck all.
Laporte gets a hard time of it on here, People hace short memories, He was our best defender (playing through injury) last season when we were down to the bare bones defensively. He's more than good enough to deal with Saka tomorrow night.
A game that always sticks out for me with Laporte is the 2-1 win over Liverpool at The Etihad when Sane got the winner. Laporte was left back that night up against Salah. That was his best game in a City shirt he was immense that night. He's proved numerous times before he can play there.