Unadkat is set to be available for at least three of Sussex's remaining four matches, starting with the game against Durham on September 3. He could, however, miss the team's final match, if he returns to lead Saurashtra in the Irani Cup, which starts October 1.

"I have been following the team's recent run of success and I had a nice conversation with Paul [Farbrace, Sussex head coach] and it looks like I can definitely add value and contribute towards the team's goals," Unadkat said in a release. "The English County Championship has a wonderful legacy, and I was keen to grab the opportunity whenever I can and it seems to be the right time for me at this point in my career."

"I hope to add to the laurels that my dear friend & team-mate, Cheteshwar has been adding aplenty while representing Sussex for the last couple of seasons, and more importantly helping the team win games," he said.

"We are delighted that Jaydev will join us for the September championship period, he is a quality bowler and a great guy to have join our squad at an exciting time of the season," Sussex head coach Farbrace said. "His record is outstanding, and we will be looking for Jaydev to share his experience with our developing team. Everyone at Hove is looking forward to Jaydev being part of this Championship run in and help the team to take wickets and win games of cricket."

Unadkat recently turned out for India in their two Tests against West Indies, but went wicketless. He did however pick up a wicket in the only ODI he played on the tour.

Unadkat, 31, has played 103 first-class matches, including four Tests. He has picked up 382 first-class wickets at an average of 22.58 and an economy of 2.94.

Unadkat captained Saurashtra to their maiden Ranji Trophy title in 2020, taking 67 wickets in that campaign, which is the most by a fast bowler in a single season.