TOI understands that Krishna has been given a three-week timeline when he reported to the Centre of Excellence (CoE) after he walked out of the second ODI against West Indies in Guwahati on Sept 30. Seam-bowling allrounder Rana, who has been at the CoE since July, is expected to undergo a return-to-play match simulation on October 25 before the ODI and Test squads are expected to fly out on Oct 28 with the ODI series scheduled to start on Nov 4.