EIGHTEEN-year-old centre Josh Simm, who is expected to be one of a number of Saints debutants in London on Sunday, has reaped the benefits of playing at Leigh this this season.
Simm, who has starred on dual reg with the Centurions, is set to feature in the clash at Ealing - with hooker Josh Eaves and Callum Hazzard also in the squad alongside 17-year-old Lewis Dodd.
Saints will be leaving out around nine first teamers with 'bumps and bangs' ahead of the following week's Challenge Cup semi-final.
But Saints are blessed that they can call into their Academy well - but playing Championship at Leigh will have helped Simm and Eaves.
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Holbrook said: "A few of these lads have played on dual registration with Leigh Centurions and that has helped.
"In particular Josh Simm, who has not simply gone and played at Leigh - he has been their best player every time he has played for them.
"This is a great reward for him."
Simm is from good rugby league stock, being the grandson of the late former Saints skipper Geoff Pimblett, who scored 1388 points in 365 appearances for his home town club in the 1970s.
Simm has racked up 23 tries in 13 appearances for the Academy this season so far.
Josh Eaves will probably get a bench spot, with Aaron Smith starting at nine.
"Josh is another great young kid, but he has been hurt by not having a reserves in terms of getting game time," Holbrook said.
Jack Welsby, who has scored three tries in six appearances so far this term, has not played in the first team since Saints' last defeat at London.
He will get another shot this week, with Lachlan Coote among the nine missing.
"It was a great learning curve for Jack Welsby last time around.
"He will get another shot," Holbrook said.
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