The 18-year-old got to make his Premier League debut for the Club and was an impressive figure with his darting raids down the left flank from his midfield position. The only downside for the Welsh international was the final outcome.
"It was obviously a special occasion for me, making my debut at one of the biggest clubs," said Gareth. "I thoroughly enjoyed it, but it is just a shame about the result.
"I can play both positions and it is up to the manager where he plays me. I was just thankful to be on the pitch - I enjoyed nearly every second of it.
"We played well, in the second half especially, and got a few more shots on target. We looked like we were going to score, penalty decisions went against us and we must now look at the positives from this game and take them into our next one.
"Football can be weird, sometimes it goes for you and sometimes against. We will now kick on with our season and get a few wins. We matched Manchester United around the pitch and hopefully we can turn any negatives into positives and kick on from here," added Gareth, with an eye on next week's encounter with Fulham at Craven Cottage, a fixture he views as no different to any other.
"Every game is a must-win game, we played really well in certain parts of the game and must now look towards the future and get some wins under our belt. We will give 100 per cent to do that," he continued, before admitting that a starting position on Sunday did come as something of a surprise.
"I wasn't really expecting to start and was thankful the manager put me in. Hopefully I have done enough to keep my place for next week."
Gareth Bale believes the team must take the positives from Sunday's narrow defeat at Old Trafford.The team were on the wrong end of a 1-0 scoreline against the champions after dominating most of the game and having two penalty claims waved away by the referee.