Heavy loss embarrasses McNamara
Dundee United manager Jackie McNamara admitted he was embarrassed after his side were thrashed 6-1 by Celtic.
United went into the game top of the Scottish Premiership table with two wins from two matches, with no goals conceded.
But they were taken apart by the defending champions and McNamara felt his players were culpable for not doing the basics right.
"It's really frustrating. The scoreline is embarrassing in the end,\" he said.
"I was confident coming to the match as I felt we could come and, not just participate, but win it.
"But if you don't do your jobs properly - the fundamentals - then you're going to get punished. To lose four goals from set-pieces is especially disappointing and very unlike us.
"We'll put it behind us and on Monday we'll go through it and make sure it doesn't happen again."
United captain John Rankin also felt they had let themselves down at Celtic Park.
"We were only two games in but the way we've been playing, our expectations were high," he said.
"But to concede four from set pieces especially was disappointing.
"People talk about a title challenge - for me you get judged on performances in Glasgow and we let ourselves down badly.
\"We need to put that behind us now."