Saints have qualified for the group stages of the competition, meaning at least six additional matches from mid-September until early December.
"We've got players who've played in the Champions League," said 28-year-old Forster.
"We're in great shape. We want to have a real go at it next season."
"Maybe a couple of players will come in and a couple will go in the summer," he added.
"I don't think we need a lot to add to the quality that we've got."
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