Gavaskar said that Jadeja can be a wicket-taking bowler with his left-arm spin as he has done in the past and can also contribute with the bat, making him ideal for the number seven spot.
Asked whether India should go with five bowlers against South Africa tomorrow, Gavaskar said, "Having five bowlers gives you more options. But often the fifth bowler does not get much chance to bowl. In Sri Lanka, Harbhajan Singh did not get to bowl as many overs as you want.
Gavaskar said he would pick Jadeja in the playing XI as he is the ideal candidate for the number seven spot in Test matches.
"Pick Jadeja in the playing XI. He can bowl beautiful deliveries as he did a couple of years back against Australian captain Michael Clarke in Mohali," he said.
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"In limited-over matches, he can be a bit expensive but in Tests he is the ideal number seven player. He is a fabulous fielder also and so he can contribute in all departments of the game," said the former Indian captain while pitching for Jadeja.
"If India have to win, R Ashwin is the key man. He is the five-plus wicket taker in the team. You cannot say other bowlers as five-plus wicket takers. When Ishant Sharma comes back, India will have two five-plus wicket takers.
"If the (Indian) batsmen put up a big score, Ashwin will be more confident and that will give India the chance to win," Gavaskar told NDTV.