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Sinckler on a collision course with Blues' No 1

Leinster's Marco Caputo carries serious experience, most recently working for The Brumbies as scrum coach and with Mitsubishi Dynaboars in Japan.

On retirement, his path took him to four years at the ACT Brumbies, one year at Worcester, three years at Clermont Auvergne and then Harlequins.

In short, he knows the game ad he likes what he sees in Jack McGrath.

"He's still only a baby, 25-years-old and his best years are in front of him," said the Australian.

"He offers you things that most players at that elite level of Test rugby don't give you. He'll consistently top the tackle count, he's very good when he carries the ball. He's very good on his detail and doesn't make mistakes.

Can he dominate at the highest level?

"The more time he spends playing at that level, being able to mix it up with the big South Africans, the big Kiwis, that's just going to happen by way of clocking up miles on the clock."

Harlequins have a terminator of their own in 21 year-old tight-head Kyle Sinckler (inset).

"He's feisty. They're not too dissimilar in nature.

"Jack, he can have a short fuse as well and it should be a good match up. Sinclair's 21, 22; 18-19 stone -a big lad - who can be very disrupted when he gets his act together.

"Jack will be looking to stamp his authority on that area and we'll look for Jack to make his mark and do his job at set-piece time to do that."