Dallas signed a new three-year contract at Leeds towards the end of the summer transfer window which will see him remain at Elland Road until the end of the 2019-20 season.
Leeds head coach Christiansen has praised Dallas, and has expressed his delight at the decision of the former Crusaders star to commit his long-term future to the Whites.
“I like the good players, the players with the right mentality, ambition, and he is one of them,” Christiansen is quoted as saying in a video posted in The Yorkshire Evening Post about Dallas. “That he renewed his contract is very good, good sign.”
Dallas joined Leeds from Championship rivals Brentford in the summer of 2015 for a transfer fee reported by Sky Sports to be worth £1.3 million.
The Norther Ireland international, who can also operate as an attacking midfielder, joined Leeds when Use Rosler was the first-team head coach and worked with him at Brentford.