Craig Sandercock says Hull KR must be "more disciplined" after their defeat at Wakefield.
Graeme Horne's sin-binning midway through the first half enabled Wakefield take control of the game at Rapid Solicitors Stadium, as Rovers conceded 18 points.
"We got ourselves in a position to win," said Sandercock.
"But we conceded a few penalties on the run and a couple of crucial decisions went against us.
"In the end Wakefield were too good.
"If we get an ounce of luck and if we are more disciplined, we have a semblance of a good footy team."
Meanwhile, Lincoln Withers is out of hospital after being knocked cold in the first tackle of the match.
Withers received treatment on the pitch for a gash to his head.
He tweeted last night: "(Got to) love rugby league - thanks for all the thoughts - out of hospital - head a little sore."• Read the best and most comprehensive match reaction in Monday's Mail.
• Match report: Wakefield 36 Hull KR 20
