Under fire - Shoaib Akhtar

Chappell told Indian TV: "There is something seriously different about it.

"His action is very difficult to pick up. Sometimes people are just caught by surprise. I have seen people hit by him, not least Sachin Tendulkar."

But Pakistan coach Bob Woolmer told BBC Sport: "The International Cricket Council has a report circulating which says he is not to be questioned again."

Pakistan completed a 1-0 Test series win on Wednesday, Shoaib taking three wickets in the deciding final match.

The fastest bowler in world cricket, he was suspended in 1999 for a suspect action.

But he was later cleared when it was agreed his elbow is built with extra flex in it, causing "hyperextension."

Chappell is adamant the bowler must be re-tested, arguing: "I don't buy the argument that it's because of a deformity.

To bring it up during a Test match and blast it all over the papers is disappointing Bob Woolmer

"The ICC has some new software they are using to scrutinise actions and everyone who is playing at the highest level, including Shoaib, should be checked."

Biomechanics expert Bruce Elliott, who has carried out the testing of bowlers such as Akhtar and Sri Lanka's Muttiah Muralitharan, said it would serve no purpose to re-examine either player.

"They have already been tested and cleared," he said.

"Shoaib gets hyperextension, which the ICC says is OK, and rightly so.

"Otherwise, you would run into problems with disability and people would take them to the high court. It's an abnormality in the arm, he is double-jointed."

Woolmer said: "To bring it up during a Test match and blast it all over the papers is disappointing and hard on the player.