Raina, on the other hand, has been a stop-gap captain in shorter formats. Elsewhere, batsman Ajinkya Rahane is set to be picked for the series starting on July 10.“Ashwin and Kohli are playing both formats. Dhoni has also had a lot of workload since the Australia tour followed by the World Cup and a gruelling IPl. These three require rest. A fresh Kohli and Ashwin are a must for Sri lanka Tests which will be a very tough assignment,” a BCCI said.