Stephen Parry and Dane Vilas have signed contract extensions with Lancashire that will see them stay at Old Trafford until at least the end of the summer of 2019.
Slow left-armer Parry played 13 County Championship matches in 2017, having previously featured in just nine in his career.
"I've always loved playing for the Red Rose and I am delighted to have signed this new contract," Parry said.
"We've got a very talented group of players in the changing room at the moment and it's an exciting time to be playing for Lancashire. We made some really good progress last year and it's important we build on that in 2018.
"As a group, we're all desperate to win more silverware for the club and hopefully we can achieve that in the next few years."
South African wicketkeeper-batsman Vilas hit 662 runs in his debut Championship season which included a double century against Hampshire.
The 32 year-old said: "As a team, we want to be challenging for silverware and we have all the qualities to do that with the talented squad we have."
Lancs head coach Glen Chapple added: "Stephen is someone who embodies what it means to be a Lancashire player and his experience is of great benefit to the younger guys in the dressing room.
"Dane had an impressive first year at the club both on and off the field. He has become a very important part of our changing room and he contributed with some excellent performances last year."
View all Cricket betting