South African left arm spinner Keshav Maharaj had agreed to re-join the White Rose for their opening two Specsavers County Championship division one fixtures against Gloucestershire and Essex.
Maharaj took 38 wickets in his five Championship appearances for Yorkshire in 2019, at an average of 18.9, with only fast bowler Duanne Olivier taking more wickets for the county.
Later this summer, Yorkshire were set to add yet more international experience to the spin department with India’s Ravichandran Ashwin.
The ICC Test Player of the Year for 2016 and four-time Test Team of the Year all-rounder was due to play the majority of the remaining Championship matches.
West Indies batsman Nicholas Pooran had agreed a second stint at Emerald Headingley after the 24-yer-old has agreed to re-join as Yorkshire Vikings’ Vitality Blast overseas player for the 2020 campaign.
However, due to the global coronavirus outbreak, all parties have come to an agreement to cancel these contracts.
Martyn Moxon, Yorkshire’s director of cricket, is hopeful that the players can feature at the county in the future.
“Firstly, I really appreciate the players’ understanding in this matter,” said Moxon.
“We have been in regular contact with the players and their agents throughout this Covid pandemic.
“They have been extremely professional and appreciate the uncertainty facing counties at present.
“We hope that we will be able to see them at Emerald Headingley in the future.”