Preston North End manager Phil Brown says he is disappointed with his team's defending in recent games.
The League One side have conceded 10 goals in their last three matches and twice lost the lead in Tuesday's 3-3 draw with Oldham Athletic.
"The fans have been massively patient, I sense that's going and I understand," Brown told BBC Radio Lancashire.
"Individuals are not doing their jobs properly, some of the defending has been amateur."
Brown added:"Its not professional enough and its not for a want of trying.
"We are talking about defenders who have defended all their careers.
"Its about communication, its about filling in space, its about being physical and dominating the player you are up against."
Preston are ninth in League One and are back in action on Saturday when they take on Bournemouth at Deepdale.