Adam Clayton will return to the Middlesbrough squad after sitting out the Carabao Cup victory at Aston Villa in midweek through suspension. Clayton collected his fifth booking of the campaign during Saturday’s 3-2 league win over QPR but is available once again.
“Boro are always strong,” said Kalas
“They were strong two years ago. They always know what they’re doing, they’ve always got good players and they’re always going to be favourites to get promoted.
“I would agree that they’ve got one of the strongest squads in the league.”
Martin Braithwaite has returned to training after being sidelined since the opening day of the campaign by a hamstring problem, although the game is likely to come too soon for him, while fellow striker Rudy Gestede continues his recovery from thigh surgery.
Skipper Tom Cairney is still struggling with a knee injury, Lucas Piazon is recovering from a broken leg and Rafa Soares is out with an ankle problem.