The 25-year-old, who also played under Mark Cooper at Swindon, played 59 times for Rovers having signed for the club in 2016.
A club statement said: ‘Everyone at the club would like to wish Drissa all the best for the remainder of his career and thank him for the contribution he made during his time here.’
New Walsall manager Dean Keates will be in charge for the first time when promotion-chasing Wigan visit the Banks's Stadium on Wednesday night.
Rochdale have no new injury worries ahead of Tuesday's Sky Bet League One relegation battle with fellow strugglers Fleetwood.
Northampton striker Kevin van Veen is hoping to make his first start in over a month in the home game against Shrewsbury.