Kent seamer Harry Podmore has signed a new deal the the end of the 2021 season, while batsman Zak Crawley has agreed an improved two-year contract.
Podmore, 24, arrived from Middlesex in April and took 43 wickets at an average of 23.30 as Kent won promotion from Championship Division Two.
Crawley, 20, was an ever-present in four-day cricket for his home county in 2018, making 755 runs in the process.
He also scored his maiden first-class century against Glamorgan.
"Harry has fitted into the squad brilliantly both on and off the pitch," director of cricket Paul Downton said.
"His capabilities with both bat and ball are there for all to see.
"Zak's game is going from strength to strength, so obviously we're very pleased that he has signed a new deal with us."