The Three Lions advanced into the last 16 of the European Championship in top spot after Raheem Sterling’s early header earned them 1-0 Wembley win.
Saka, 19, was named star of the match by UEFA after a fine showing in what was his debut appearance in a tournament game for England.
The Arsenal forward will now be aiming to keep his place as Gareth Southgate’s men look to tackle the knockout stages, with Saka admitting his display against the Czechs is something to build on.
“The performance does give me confidence,” he said.
“Most importantly gives the team confidence. That’s our third clean sheet and of course we scored a goal tonight and could have scored more, played some good football.
“Now we have our fans back it will be a real push for us and give us a lot of confidence whoever we come up against.
“The objective was to top the group and qualify, and we have done that. That’s job done. Now it’s onto the next round.
“Of course it is going to be much harder teams but we can take a lot of confidence having not conceded a single goal and having played really well in this last game, playing some good attacking football.
“Going into the next game, whoever we come up against, we go into it with real confidence, especially with it being at Wembley as well with our fans.”