Gareth provided assists for two of Jermain Defoe's three goals against the Slovenian champions and gave full-back Martin Melic a torrid time down the left flank.
He showed exactly the same form when we were last at the Etihad, when his spectacular 25-yarder into the top corner levelled the scores at 2-2 in the second half after we'd trailed 2-0.
He almost combined with Jermain again in injury time to win the match but then City broke up the other end, were awarded a penalty and won a thriller 3-2 in the 94th minute.
City remain unbeaten but Gareth believes we can take our form from Thursday night back into the Premier League.
"We needed the right reaction after the weekend and we certainly did that," said Gareth. "The lads are delighted and we’ve got to maintain that form now going into the Premier League.
"This is another big game. We went there last season, gave them a good run for their money and probably should have won, but it wasn’t to be.
"We’ll go back up there full of confidence again after playing well against Maribor.
"We know it will be very difficult on Sunday and we’ll give it our all. We’ve played well away, we'll prepare right and hopefully we'll get the right result."
The flying Welshman was at his unstoppable best in Thursday night's 3-1 win against NK Maribor in the Europa League and is determined to take that form to the Etihad Stadium.