Du Plooy, who has 2,692 first-class runs at an average of 48.08, was this year's CSA Provincial One-Day Challenge's leading run-scorer with 593 at 74.12 for Northerns
Derbyshire have signed South African batsman Leus du Plooy on a two-year contract, keeping him with the club until the end of the 2020 season.
The 24-year-old batsman joins the club on a Kolpak deal and will represent Derbyshire in all three formats.
Du Plooy, who has 2,692 first-class runs at an average of 48.08, was this year's CSA Provincial One-Day Challenge's leading run-scorer with 593 at 74.12 for Northerns.
In 39 List A matches, the left-hander has scored 1,528 runs at an average of 56.59.
🗣 "I'm looking forward to learning a lot here at Derbyshire."
— Derbyshire CCC (@DerbyshireCCC) April 18, 2019
du Plooy ready to hit the ground running 💪🏏#WeAreDerbyshire#WelcomeLeus pic.twitter.com/AtvSX22sfs
Head of cricket Dave Houghton said: "I’m delighted to have Leus here because we’ve been monitoring his progress for a while now and been very impressed with what we’ve seen.
"He will strengthen our depth alongside the talented home-grown middle-order that we already have and his recent form speaks for itself, so I’m looking forward to see what he can do for Derbyshire."
Du Plooy himself commented: "I’m looking forward to getting started with Derbyshire. I’ve wanted to play in England for a while so I’m delighted to finally be here and get straight into the season.
"The squad have made a good start to the summer and I want to score runs and do well for the team, so hopefully we can get more wins for Derbyshire."