Tomas Kalas says it was disappointing not be called up to represent the Czech Republic over the international break, but admits the pause in his hectic schedule was a welcomed momentary respite. 

The defender wasn't involved for his country against Scotland last week, but Kalas was comfortable in the knowing that he will be rested up ahead of April's hectic schedule.

"It was disappointing not get called up but it was at the time I wasn't playing much," he said. "It was understandable, but also nice for me to get a break.

"Everyone knows the Championship is one of the most difficult leagues in Europe with the amount of games you play and travelling you do across the country. 

"We have eight games in April so it's going to be Saturday, Tuesday constantly. That's what I'm getting at when I say this league is so hard."

Following the injury to Dani Ayala, Kalas alternated with Dael Fry at centre-back and the Chelsea loanee recently starred in the 1-0 win over Hull before the break.

After Ayala made his first steps on the recovery ladder against Sunderland last week, Kalas believes his teammate is the best in the division when fit.

"It's really difficult to replace Dani Ayala," said Kalas. "For me, Dani is the best central defender in the league when he's playing and not injured. 

"Everyone wants him back so it was a challenge to reach the level that Dani was playing at his best before his injury. 

"Hopefully in the last few games I've managed that or at least been close. It would be perfect to keep going like that, but Dani is probably back and we've got a lot of good players.

"Nobody knows who's going to play so we will see. Whoever plays well in training will play."