The duo told TV Line that they have already discussed ways to keep the series going in the future.
"We've had conversations about rewinding back to 2005 and doing a series called How I Met Your Father," Thomas joked.
"From the perspective of what was happening with the Mother all those years. Occasionally, she'll stumble through McLaren's and no-one will see her."
Bays also unveiled a possible future format for the show, saying: "One way to go is to finish the [mother] story at the end of season eight, and then season nine is, 'Oh, by the way, kids, I left some stuff out...' And then it's just 24 little stories that took place over the course of the series here and there. Like, 'Here's something funny that happened in 2006'."
Bays recently admitted that setting an end date for How I Met Your Mother is not a "high priority" for him, explaining that he wants to continue until the writers run out of story ideas.
The show airs on Mondays on CBS.
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