The 17-year-old made his Tottenham Hotspur debut last night.
The 17-year-old was speaking to the club's channel after the north London side's 4-2 win over Burnley in the FA Cup.
The victory marked a special occasion for Onomah, who made his first senior appearance in a Tottenham shirt.
And Onomah admits Winks's first-team debut earlier this season provided a boost for the rest of the Under-21s, giving them the confidence that they could go on and achieve the same feat.
"I was happy for Harry when he made his debut. That helped the rest of us, the Under-21s. It gave us a boost and a sense of confidence. Harry's debut helped us," the 17-year-old told Tottenham's website.
Tottenham's win did not come easily, with Mauricio Pochettino's side going 2-0 down to the Clarets within minutes. Spurs hit back with four, however, finally putting the Burnley tie to bed at the second time of asking.
Onomah came on during the second half, when his job was simply to keep things steady as Pochettino's men looked to see out the tie.
Next up for Tottenham are Sunderland - also at White Hart Lane - as attentions turn back to the Premier League this Saturday.