Derbyshire fast bowlers Tim Groenewald, Ian Hunter and Tom Lungley have agreed new contracts with the county.
The trio have all penned deals that will keep them at the County Ground through the 2010 season.
The news provides another boost for Derbyshire, who recently announced that captain Chris Rodgers had pledged his future by signing a contract extension.
John Morris' side narrowly missed out on promotion from the LV County Championship Division Two last season, despite Groenewald topping the bowling averages for the division.
The 25-year-old took 34 scalps at 27.08 apiece, recording two six-wicket hauls in the process.
He also took 19 wickets in the limited-overs form of the game, and Morris praised the determination shown by the former Warwickshire man to force his way into the four-day fold.
"Tim had to wait patiently before his opportunity came in the first-class arena," Morris told the club's official site. "His attitude during that period was excellent and he was clearly focussed on forcing his way into the side.
"Once he achieved that, Tim never looked back and was a whole-hearted performer and a regular source of wickets for the team."
Team-mate Hunter took 21 wickets at an average of 28.23 last season, while Lungley - who has 130 first-class wickets to his name - will spend his 11th season at Derbyshire.