Neil Warnock cut a frustrated figure after Boro's defeat to Millwall.
Grant Hall put through his own net in unfortunate fashion, the only goal of the fixture.
"I thought the first half was very poor," Warnock said.
"You need passion when you come to Millwall, and we didn't show that.
"It's hard here when you go behind here, and they played it well to be fair.
"If we play like that, Millwall or anywhere else, we can forget the play-offs."