"He is a good guy. With a Kevin Pietersen, he is one of the most dangerous batsmen in the world. No one likes bowling to him," Warne said.
The former Australian leg-spinner said Sehwag is not just about natural talent.
"To play a hundredth Test match, you need a lot of things going for you, outside of just natural talent. He is a very good player. You have have to have commitment, dedication, that sacrifice.
"You have to be prepared to play for a long period of time. So to see him play his 100th match tomorrow is going to be fantastic. I am very happy for him to get to hundred Test matches," Warne added.
Test cricket's second highest wicket-taker and of the most charismatic players to have graced the game, Warne was pleased to see Sehwag returning to his old usual self after a lean run.
"I know a lot of people doubted him when he first came into the side. He has been through a bit of form slump so it is great to see him back, smashing all the attacks as he does.
"He is great to watch and I wish him the very best for his hundredth Test," Warne told reporters at an event here, on the eve of the second Test against England.