The 20-year-old Armstrong opened his Rangers account before charging clear to set up Kenneth Paal’s second-half clincher, with Ike Ugbo’s open-goal finish nothing more than a consolation for Cardiff.
“I told Sinclair in the hotel that he was going to score his first goal and the beaming smile on his face gave me confidence, never mind him,” said Ainsworth.
“He’s a man of few words. He just said: ‘Cheers gaffer’. He told me after the game: ‘You were right gaffer’. He’s a work in progress, but we’ve got a real diamond.
“He’s young and come out of a lower level in Ireland. He’s not had enough games in the Championship yet, but he will get there and he’s like a 100-metre sprinter.
“He’s the quickest player I’ve ever worked with and is going to cause serious problems for defences.”
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