The Scottish Premiership champions suffered a shock 1-0 defeat to Lincoln Red Imps FC in the first leg of the Champions League qualifying second-round tie away from home at the Victoria Stadium in Gibraltar on Tuesday evening.
The Bhoys were expected to win the game comfortably, but Lee Casciaro’s goal three minutes into the second half proved to be the difference between the two teams.
Armstrong, who is 24 years of age and came on as a substitute in the second half against Red Imps on Tuesday evening, has revealed what manager Rodgers told the players after the loss.
“You have to reflect on the game but not dwell on it too much,” Armstrong told The Glasgow Evening Times. “You need to focus and prepare for the next game. It obviously wasn’t the result the manager was looking for. But he told us just to be calm and to learn from it.
“He was pretty much the same in private as he was in public. His philosophy is that we are all together and pushing for the same thing. He wants us to be very much a team.”
The second leg of the tie between Celtic and Red Imps will be held at Celtic Park in Glasgow next week.
The Scottish Premiership giants will head into the game as favourites, but they should not get complacent.
If Celtic concede an early goal, then they could be in for a shock exit from the Champions League qualifying.