"The game was in good spirit in the main and ideally it's not what you want to see".
"It was odd him getting booked for it". We'll have a look at it and get the thoughts of the officials and see why it happened.
"It was maybe a bottle of some sort, but anything, whether it's a coin or a bottle or whatever, shouldn't happen. I feel much more in control of where I need to be when we don't have the ball and are defending".
Asked whether he was concerned during the game, Rodgers said: "I didn't see or haven't heard as of yet what was thrown on. The scoreline was okay, it could have been better but it gives us the advantage for the second leg".
The former Rangers striker said: "Linfield as a club have made giant strides over the years to try to cut that shouting and abuse out but you get that in Old Firm games, you get that in Manchester derbies, you are always going to get a ferocious red-hot atmosphere".
"The club will be reviewing our own footage and investigating", read a Linfield statement. "The club takes the safety of fans, players and officials extremely seriously and there will be serious and lasting consequences for anyone involved". You want the passion from the stands to stay in there. Fatigue and the impact of mass substitutions then took their toll.
His side Celtic have also been charged with improper conduct of the team under Article 15 (4), after they picked up five bookings - a standard charge for teams who receive cards for five or more players in a particular match.
While veteran Northern Ireland worldwide Roy Carroll was forced into a number of smart stops in the home goal, there was a sense that the Brendan Rodgers' team rather took their foot off the gas after going 2-0 up with 22 minutes.
"I had to work on everything about the position as I had never played there before I came to Scotland".