For Stuart Armstrong, it was a night that will live long in the memory.

The 22-year-old midfielder, signed by Celtic little over a fortnight ago from Dundee United, took to the European stage as though he had been playing on it for years.

It was Armstrong who took the credit for hauling Celtic back into the game after they looked dead and buried after Inter's two early goals.

Indeed, his performance underlined his credentials as a player of considerable potential.

It has been an astonishing start to his Celtic career for the articulate midfielder.

It was Armstrong's intelligent reading of the game that allowed him to fit so seamlessly into the side.

But while the player was thrilled with the manner in which he experienced a heady European night at Celtic Park, he has insisted that he doesn't believe he has established himself in Ronny Deila's team just yet.

"I have made a good start, but there is plenty of games to come and plenty of time to prove myself," he said.

"But to get a couple of goals and help the team that is all good coming in halfway through the season. I am just happy to have scored and contributed to the team.

"I am claiming the second even though it might be a bit of a dubious one. I got a wee touch on it so I will take it.

"I have never been to Celtic Park on European nights so I did not know what to expect and we were talking before the game about what it would be like.

"You'll Never Walk Alone was so noisy and after we came out of the huddle it was something I have never experienced before and something that I want a taste of over and over again.

"The noise levels blew me away, but all the nerves went away as soon as the game kicked off and I just focused on getting something out of it and enjoying it."

While the Scotland under-21 internationalist admitted to pre-match nerves, he certainly didn't show it when he took to the field.

And although he has quickly endeared himself to both his new team-mates and the Hoops supporters, he is wary of taking anything for granted.

"There were a lot of thoughts before the game about how I wanted to play and about how I wanted not to be overwhelmed by the occasion," said Armstrong.

"I don't think I was. It is a team game but as an attacking player you want to create goals.

"You want to score goals so to get myself on the scoresheet against such an established team is just an incredible feeling.

"But it is not just a one-game season because throughout the course of it you have to have consistency.

"But when you come up against the best you need to show your worth. "

And while Celtic's task in the San Siro on Thursday night is an arduous one given the fact that they conceded three away goals, Armstrong has underlined the need to approach the game with confidence.

"Of course we believe," insisted the midfielder. "If we didn't believe there would be no point in going out and playing.

"We have put ourselves in a good position. They have the advantage of the away goals of course but we are going there to win and everyone's mentality will be high and confident. We have nothing to lose.

"We were a bit disappointed about how we conceded. That is something we can definitely improve on.

"The two goals lost early on obviously did not help us, but we had a lot of opportunities to carve them open and we could have scored more goals. "

Armstrong's former Tannnadice team-mate, Gary Mackay-Steven, also impressed against the Italians and it is the winger's pace that Armstrong believes could be key against the Serie A side on Thursday night.

"I thought he was terrific in the way he runs at defenders," he said.

"He had them on the back foot and he was a real threat for us going forward.

"He had a shot that the keeper saved, Leigh Griffiths had a chance so we will take confidence from that when we go to the San Siro.

"The way he plays all it takes is the perfect pass and he is away on the break.

"If we get one of those passes to him, he can break the lines and he has incredible pace.

"The way he gets away from defenders is just phenomenal. That is something we will be looking to utilise over there. "

And Armstrong has also insisted that there will be no lethargy from Celtic tomorrow afternoon when they host Hamilton Accies.

It is a big change to switch from an electric, capacity stadium to a ground with empty-seats and a low-key atmosphere for a run-of-the-mill domestic encounter.

But the midfielder has maintained that the league form must continue.

"I don't think there is a danger of an emotional comedown," he said.

""We will make sure we are all focused, we get the right recovery in.

"The focus is on the league now and that is where our attention lies now.

"Every game is an important game at this time of the season when we are pushing on every front.

"We will go in with the same mentality as we did against Inter Milan and try to get the three points. "