The highly-anticipated third season of Derry Girls may be the last, according to Tommy Tiernan.

The actor, who plays Erin's da Gerry, was speaking on The Jason Manford Show on Absolute Radio when he was asked what the future holds for the series. “This is the last series, I think. As far as I know this is the very last series," Tiernan said. He also revealed that the third season will begin filming next month, as he praised his co-stars. “I feel lucky to be working with such funny people. There are two members of the cast that I can’t look at because I laugh. It’s enough to bring you out in sweats. Kathy Kiera Clarke who plays my sister-in-law… Kathy is one of the funniest people that I’ve ever worked with and I’m just not able to look at her," he said. "I mean this sincerely, as soon as I get the scripts I will rifle through it, first of all to see my own scenes and then to pray to God that I don’t have an awful lot of scenes with [Kathy], because I’ll be getting the sweats the night before. Like how can I keep a straight face? We find it very difficult… and I also find it impossible to look at Orla who’s her daughter." Season three of Derry Girls was announced soon after the end of season two. Earlier this year, the series' creator Lisa McGee teased what fans can expect from season three of Derry Girls.  "They're still eejits and they still get into a lot of trouble, but they're certainly going to grow up a little bit," McGee told Red Carpet News. "There's definitely a very personal journey that they go on, as well as a political one. It's an exciting time for them because they're just on the cusp of adulthood. There's lots of new guest characters, as always. In every episode, we have a new big guest star come in. That's really exciting, writing those (roles). That has been good craic, looking forward to shooting all of that."