The 34-year-old, whose claims to unveil a mystery delivery he called teesra (the third one) surrounded the build-up of the three-Test series, helped Pakistan bundle out England for 192 on a slow turning pitch at Dubai Stadium yesterday.

Pakistan finished the day on 42-0, trailing by 150 runs.

Former England paceman Bob Willis raised suspicions over Ajmal's action.

"The off-spinner is fairly orthodox. The delivery that I have a problem with is the doosra (second one)," Willis, referring to Ajmal's delivery which turns the other way than the normal off-spin, while commentating on Sky Sports in England.

"The ICC have accommodated this delivery – they changed the rules to allow these bowlers to bend their elbow 15 degrees which is what makes it so difficult for the batsmen," said Willis.

But Ajmal said he was not worried about his action.

"I am just focusing on my bowling. I don't know about that and it's the responsibility of the umpires and referee to check my action. I have bowled my best so I am happy," said Ajmal whose action was questioned once in 2009.

"They did it to Saqlain Mushtaq," said Ajmal about the former Pakistan spinner, regarded as the founder of doosra. "They are doing it with me now. Australia questioned my action (in 2009) but I see no problem with it."