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Thomas signed on loan from Charlton for a season today and Redknapp laid down the gauntlet to his new charge.
The winger is back in the Premier League following a spell with Charlton after leaving Arsenal for the south London club.
The youngster believes his development can be aided by Pompey's impressive batch of experienced professionals.
In today's pre-match press conference ahead of Sunday's game against Chelsea, the Pompey boss challenged Thomas to take his chance.
Redknapp said, "He's got good ability, terrific ability and now it's up to him.
"We've given him that stage and now he's got to take that chance."
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The full article contains 160 words and appears in The News newspaper.