The Manchester City man scored a superb treble in the 4-1 triumph at Craven Cottage that lifted Gus Poyet's side off the bottom of the Premier League.
Arsenal attacker Theo Walcott's knee injury - which looks set to rule him out of a place in Brazil - has given many English wingers a chance to a shine.
And Johnson hopes he can take advantage, despite not being called up for his country since a friendly win over Italy in August 2012.
He said: "I was disappointed for Theo, he's a good friend of mine.
"I came a long way in the England ranks with him, I was gutted for him when I found out he was going to miss the World Cup.
"But these things happen in football and one man's downfall is another man's gain.
"So if I can be the person that's gaining then I'll be delighted.
"I want to get back to being a part of the squad, if I can keep playing well you never know about the World Cup.
"It's always been in the back of my mind but slowly the door has been closed the last few months. Now I can hopefully open that door again."