The 37-year-old was recently cleared to bowl again after undergoing remedial work on his action.
However, he failed to satisfy doubts about the legality of his deliveries in time for the ongoing World Cup and withdrew from Pakistan’s squad for the showpiece tournament in Australia and New Zealand.
Ajmal played a key, if controversial, role in Worcestershire’s promotion to the First Division of the County Championship last season by taking wickets with an action subsequently found to contravene the rulebook.
He intends to be back at the Midlands club’s New Road headquarters by early July at the latest, with his early season availability dependent on his selection, and viability, of Pakistan’s tour of Bangladesh.
“I am proud to be part of Worcestershire County Cricket Club and delighted to be coming back for a third spell,” Ajmal said in a club statement.
“I’ve had this difficult spell of my career with my action, but I knew I would come through it and have had the support not only of Pakistan but also Worcestershire throughout.
“Worcestershire have all the time stood by me, and I can assure them I will repay the faith they have shown in me.” -AFP