The 26-year-old was seen bowling to PBKS batters at the nets and spending considerable time in conversation with spin-bowling coach Sunil Joshi
Shardul Thakur starred with both bat and ball.
Mumbai reached 274/7 at stumps on Day Two, ahead by 188 runs with Shardul Thakur batting on 113 (119 balls, 13 fours) and Tanush Kotian on 58 not out off 119 balls with six fours.
India captain Rohit Sharma has opened up on surprise inclusion of all-rounder Tanush Kotian for the remaining Tests against Australia.
Tanush Kotian was on Monday added to India's squad for the remaining two Tests in Australia as a replacement for the recently retired Ravichandran Ashwin
As per reports, Tanush Kotian will fly to Australia on Tuesday and be added to the India squad as the retired Ravichandran Ashwin's replacement.
Ravichandran Ashwin, who announced his retirement at the end of the Brisbane Test against Australia on Wednesday, was a crucial architect of India's home domination that lasted for over 12 years
Australian opening batter Marcus Harris didn't move in what can be called one of the most controversial umpiring calls from the India A tour of Australia.
Tanush Kotian, who scored 64 in the first innings and resumed his innings on 20, remained not out on 114 off 150 balls, hitting 10 fours and a six.
Seasoned spin duo of Shams Mulani and Tanush Kotian became catalysts of Rest of India's sudden middle-order collapse.