Sesko made his comeback from an injury absence as a second-half substitute in Monday's 4-4 draw with Bournemouth.
“I was really happy when I came back, that I could be back with the team,” the forward told manutd.com.
“I can enjoy, have a great time and try and get better every day. It’s obviously a dream to do every single training out there and score some goals.”
Sesko says he and his teammates believe in the potential of this season's United team.
He also said, “We know this is a great team, we are preparing with full power that we can use. Try to use it in certain situations, on the weak spots (of Aston Villa).
“I think the guys are ready, we are looking forward to Sunday, trying to give our best and win the game.
“(The message from Ruben has been) obviously to try and finish attacks because we had plenty of shots (against Bournemouth), try to be more clinical and in the defence just to have more focus.
“As he says always, when we have a focus, it’s hard to beat us. We showed (that) many times, that’s the main focus for this weekend, to try and protect the net as long as possible.”