Australia fast bowler James Pattinson is returning to Nottinghamshire for a second spell with the county.
Seamer Harry Gurney will play only white-ball cricket for Nottinghamshire after signing a limited-overs deal.
England captain Joe Root and bowler Stuart Broad will face off in the opening round of the County Championship.
Keep up to speed with all the signings, departures and overseas players in county cricket ahead of the 2019 season.
Harry Gurney hopes enhancing his T20 credentials in the Pakistan Super League will help him catch the eye of England's selectors.
Lancashire bowler Tom Bailey is one of three players to secure a first call into the England Lions squad.
Champions Surrey will begin their County Championship title defence at home to 2017 winners Essex at The Kia Oval on April 11.
Vitality Blast champions Worcestershire will kick off their title defence at Notts, with Finals Day set for September 21.
The County Championship will move to a 10-team Division One in 2020 after an agreement was on changes to the structure.
Craig Overton became the second Somerset player in as many days to take a hat-trick as they beat Nottinghamshire at Taunton.
Tom Abell took a remarkable hat-trick as Somerset forced Nottinghamshire to follow on at Trent Bridge.
Essex's Jamie Porter and Sam Cook claimed four wickets each to condemn Surrey to a day to forget at the Kia Oval.
Yorkshire secured a 95-run County Championship win over Roses rivals Lancashire to take a huge step towards avoiding relegation.
Morne Morkel edged Surrey closer to a win over Worcestershire and their first County Championship title in 16 years.
Lancashire enjoyed an excellent opening day of their Division One relegation battle with Yorkshire at Headingley.
Rory Burns and Rikki Clarke make the team as Surrey edge closer to the Division One title while Matt Henry impresses for Kent.
Surrey's seamers blew away County Championship title-holders Essex as they extended their lead at the top of Division One.
Keshav Maharaj took 7-37 as his side snatched a dramatic tie in their astonishing County Championship clash with Somerset.
Surrey skipper Rory Burns scored 90 at Essex as he became the first batsman to 1,000 County Championship runs this season.
Surrey moved closer to their first Championship title since 2002 after crushing Nottinghamshire by an innings at The Oval.
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