The "Seagulls" face Liverpool next Saturday and will be looking forward to the match, after goals from Glenn Murray, Shane Duffy and Pascal Gross helped them to overcome the 'Red Devils' on Sunday.
Speaking to the club's official website, Knockaert said: "We fully deserved it. It's a great three points to get just before going to Liverpool next weekend.
"It gives us confidence going to Anfield ... with the performance we showed, we'll want to replicate that against Liverpool. It will be another tough game.
"We know they're a strong team. They've got some great players but hopefully we can get something.
"If we keep playing like this at home, and improve away from home, it will be a good season for us."
Liverpool won their season opener 4-0 against West Ham and will take on Crystal Palace on Monday night.