Tranmere boss Ronnie Moore is determined to bolster his defence after watching Rovers slip to a 5-0 loss to rampant Peterborough.
Posh captain Tommy Rowe scored for the third time in four games to put the visitors ahead on 14 minutes before Tyrone Barnett doubled the advantage at Prenton Park.
Tranmere then saw Andrai Jones sent off for bringing down Barnett in the box, with Grant McCann dispatching the penalty, and Britt Assombalonga and Mark Little both scored in the second half.
Rovers have now conceded 13 goals in four League One games and are in the relegation zone and while Moore believed Jones' sending off was harsh he was offering no excuses for the result.
He said: "At the start of the game there was nothing in it and then a stupid mistake has cost us.
"We defended just like we have for most of the season and that is one of the reasons I need to bring someone in.
"We need to strengthen defensively but when you go down to 10 men against a team like Peterborough then you will always be up against it.
"Defensively we were awful, shambolic at times. It becomes embarrassing.
"There was a lot going on in the dressing room after the game but we need that on the pitch.
"I didn't really think the sending off was deserved but we haven't created anything.
"We knew it was going to be hard but we need to man up and do it quickly.
"Players need to take responsibility on the pitch. I can't take responsibility for them. It hurts because we have a lot of pride."