He last played for India in the two-match Test series against New Zealand.
Unadkat and Chesterwar Pujara share a very close friendship. Over the years, the two stalwarts have done exceptionally well for their domestic side of Saurashtra.
Jackson was Saurashtra's leading run-scorer in the 2019-20 edition of the Ranji Trophy.
India hasn't had a left-arm pacer playing Tests for India since Zaheer Khan last Test in 2014.
Unadkat, meanwhile, hasn't played for the national side since featuring in a T20I against Bangladesh in 2018.
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Unadkat heaped praise on his side and lauded the quality of cricket that Saurashtra has been delivering in the past eight years.
The Bengal side was all out soon after the incident for 381, giving the Saurashtra a 37-run lead.
After half of the Bengal side was sent back the pavilion on the score of 241, it was looking like the Abhimanyu Easwaran-led side would tumble like a stack of cards.
Unadkat's actions came after Sudip Chatterjee and Wriddhiman Saha frustrated the Saurashtra's bowling unit throughout the morning session.