Director Paul Feig has an idea for a sequel to his 2015 comedy Spy but he's not sure if he wants to make it.

Fans have been clamouring for a sequel to the action comedy for the past decade, desperate to see Melissa McCarthy return as unorthodox secret agent Susan Cooper once again.

Bridesmaids filmmaker Feig, who wrote and directed Spy, has admitted that he has an idea for a follow-up story, but he sometimes wonders if it might be best to leave it be.

"I definitely have an idea for a story for Spy 2, but I don't know," Feig told Slashfilm in an interview published Thursday. "I just don't know if that's the place to go right now. I'm having so much fun doing new things. And I'm so happy with Spy. But sometimes to go revisit something, you kind of go, 'Oh, we should have just left good enough alone.'"

The director noted that he is usually against revisiting his projects for a sequel, but he was recently convinced to do so with Another Simple Favour, starring Blake Lively and Anna Kendrick.

"I used to say I don't want to do sequels," Feig shared. "And then I did Another Simple Favour, but that felt like five years, and we had an idea for a story that felt good."

Another Simple Favour was released in March, seven years after the original A Simple Favour, and received mixed reviews.

McCarthy has previously stated that she's game for a sequel to Spy, which also starred Jude Law, Rose Byrne, and Jason Statham.

"Somebody set it up," she said on Watch What Happens Live last year. "I've been saying it for years. Since the day we ended doing it. I was like, 'Let's re-rack it and do it again.' I'm in. I think everybody that did it (is). We've all talked about it. We're like, 'Let's do it!'"

Feig is currently promoting his next movie, The Housemaid, starring Sydney Sweeney and Amanda Seyfried. The thriller will be released in the U.S. on 19 December and U.K. on Boxing Day.