Ian Holloway admitted that Blackpool need to get better at defending set-pieces, after conceding from another two in a 3-0 defeat at Cardiff.
After a solid start to the season, The Seasiders have conceded six goals in two games, with four of them coming from similar situations.
"We've got to be better, we've got to be bigger and we've got to be stronger than that," he said. "That's four goals in two games we've let in like that and their desire to get on the end of those crosses has got to be met by our lads. Unfortunately it's one of the simplest parts of the game but it's one of the hardest to get right. We're not doing it very well at the moment."
The manager made seven changes for the game in Wales, although injuries to Gary Taylor-Fletcher (back) and Tom Ince (hip and thigh) forced a couple of them.
"Some of the changes were forced, some of them weren't and I don't think we looked a cohesive unit, to be fair. Fletch and Incey going down on Friday didn't really help.
"It's all about putting the ball in the net and we're normally pretty good at that. Their forwards caused my defence more problems than mine did. That's how simple it is. I think we're an attacking team and we didn't look like we had an attack in us," he added.
The Seasiders will now look to get back on track when they take on Hull City at the KC Stadium on Tuesday night.