^ got it.
Kolkata can replace Haddin but they have to do it before their next game as the IPL rules state replacements can only be brought in for injured players before a franchise has played eight games. Kolkata's eighth match is against Kings XI Punjab on Saturday. Their coach Dav Whatmore confirmed Haddin's injury and said a replacement would be announced in due course.
Some people are arguing for Kevin O Brian but source says KKR has already started talking with Tamim. Lets see.
Morgan is most likely to miss later matches as he will play for England against SL. So, a great chance for Tamim (if he is selected) to play later matches.