The winger joined up with the Whites squad late after his exploits for Northern Ireland at Euro 2016.
Dallas was one of the brightest stars of the Whites' season last term in his first campaign at Elland Road, making more appearances than any other player for the club with 49 and winning the Players' Player of the Year award in recognition of his displays.
He then took that form into Euro 2016 for his country, playing in all four of Northern Ireland's matches as they reached the last 16 of their first ever European Championship.
As a result of that involvement, Dallas did not return to pre-season training until well after the majority of his teammates, and a s a result he is understandably lagging behind the rest of the squad in terms of fitness and match action.
With the start of the Championship season on the horizon next weekend, that could easily be a big concern for Leeds supporters who will be desperate to see their star back in action as soon as possible.
Monk moved to alleviate those concerns by explaining that although Dallas needs more help than most in getting up to speed, he has no worries about the 25-year-old.
Monk told LUTV: "No, he has not missed too much. It’s about sharpening him up and helping him. I have got the experience of playing with international players when they went for a World Cup.
"You got to have a different programme for them even though you are fitting them into the training we are doing. It’s a mixture of getting them up to speed with the work we have already done, the new ideas that we are putting in place.
"But he is a very intelligent lad, has done very well and is very eager to come back in."
Dallas will find himself with more competition for his starting spot this season, with Monk having brought in attacking midfielders Hadi Sacko and Kemar Roofe during the transfer window.
However, if he can any way to replicating his form of last season, then the Northern Irishman must surely be one of the first names on the teamsheet.