Forster's impressive performances in helping Celtic reach the last 16 earned him England recognition but he is still waiting for his international debut and dropped out of the squad for the friendlies against the Republic of Ireland and Brazil with Ben Foster and Alex McCarthy included along with first-choice Joe Hart.
"The Champions League is important for us generally and it's important for me to be trying to force my way into the squad for the World Cup," he said.
"It's just important I do whatever I can next season to get on that plane."
Forster had little to do in Sunday's final but his early save from Eoin Doyle's header proved crucial as Gary Hooper scored the opener at the other end moments later and Celtic retained control to win 3-0.
"It was a comfortable save," Forster said. "It was nice to contribute and play my part in the game, but we were clinical in front of goal and took our chances well.
"That's what won us the game. Hoops has taken two great finishes and shown his quality."
Hooper's future looks less certain with the Englishman entering the final year of his contract and Celtic more likely to entertain bids after turning down several offers from Norwich in January.
Forster said: "You can't really argue with the contribution he has given since he walked through the door.
"Obviously there is going to be a lot of speculation about his future in the summer but he has been tremendous for us. I think everyone understands his position and just wants the best for him."