Lincoln City manager David Holdsworth has called for his players to show more responsibility towards the club.
The comments come after a group of players were seen on a night out less than 48 hours before the 0-0 FA Trophy draw against Carshalton Athletic.
Holdsworth told BBC Lincolnshire: "You must have players who are professional and adhere to the code of conduct.
"Every player has a responsibility, whether you are the club captain or a youth team player."
He added: "We talk about integrity and mentality and you must have discipline. When fans are aware of players being out on the town we must deal with it.
"If you put yourself in the public eye, whether it be through the media, social websites or physically, you leave yourself open to be judged."
Holdsworth was unhappy with his side's performance in the goalless draw with Isthmian League side Carshalton.
In a scrappy tie, Paul Vines hit the post for the visitors while Lincoln almost snatched a late winner when Alan Power struck the crossbar.
He told BBC Lincolnshire: "We didn't have enough enterprise in the final third and a few players have maybe taken Carshalton lightly.
"There wasn't enough appetite in certain areas and it was frustrating.
"Credit to Carshalton, they dug in deep and put in some good performances. It was nice for them to come here but we made it nice.
"We know we'll have to roll our sleeves up down there. I'm under no illusions that we're going to have to fight, we're going to have to work hard and players will have to show more appetite to be successful."
The draw at Sincil Bank means the two sides will replay at Carshalton at 1945 GMT on Tuesday, 17 January with the winners facing an away trip to either Worksop Town or Newport County.