"Everyone has got their own different ways that they like to set up from a corner," he said.
"The main thing is not to concede and we have conceded too many. It has cost us four points in the last three games.
"We need to sort it out. We will work hard on the training ground when we get back from international duty.
"[Marco Silva] is massive on offensive set plays too and we have scored a couple of goals that way. If we can keep scoring and stop conceding that's how you win games."