Spin guru Terry Jenner feels bowlers like Ajantha Mendis and Piyush Chawla are great talents but lack variety in their bowling.

Jenner, who gave the world a certain Shane Warne, was surprised that new Sri Lankan spin senstion Mendis did not have a stock ball in his armoury.

"Mendis needs to develop the stock ball which is very essential for leg break bowlers. When I heard that he doesn't have a stock ball, I was amazed."

"World's best spinners have great stock balls. Murali (Muttiah Muralitharan) was one of them. As coaches, we need to teach basics not magic deliveries," he feels.

Jenner opines Mendis lacks the veariety to be a major force in the international arena yet.

"What he's (Mendis) doing has been done before by bowlers like John Gleeson. He is a good bowler but I am doubtful about his success on Australian and South African pitches. He does not have variety in his bowling."

"His carrom ball is not unique, what is unique is his pace. His sudden rise in popularity is because of the fact that most of the world's best spinners have either finished their career or in the twilight of their careers."

"In Mendis, people are trying to find out Warne, (Anil) Kumble, Muralitharan but by doing so they are putting too much pressure on him," Jenner said.

Jenner also holds young Indian spinner Piyush Chawla in very high regards but again points out the lack of variety in his stock.

"Don't write off Chawla. He can be the next best thing in the world of spin bowling but he too lacks variety. His wrong ones are very deceptive but he can't bowl two to three wrong ones in an over in Test cricket," he asserted.

"He (Chawla) needs to develop his leg break to be successful in Test cricket."