The 24-year old played his part as Northern Ireland inched closer to next summer's tournament.
The flying winger played the full 90 minutes in last week's 3-1 victory over the Faroe Islands and turned out for 84 minutes as his team toiled after Chris Baird’s dismissal against Hungary.
A Kyle Lafferty strike in the dying minutes leveled things and kept Michael O’Neill’s men in pole position for automatic qualification for next summer’s European Championship.
"It’s massive. If you’d said before the Faroes game that we’d have four points from the two games then we’d have taken that," said Dallas.
"We’re still in a strong position and we’re still top of the group. We’ll go back to our clubs now and come back in October to get that result to get us over the line."
The Whites winger arrived to much excitement from Brentford this summer and has contributed to what has been a solid, if a little unspectacular, start to the season.
Uwe Rosler’s men couldn’t buy a win initially and drew their first four, before an excellent victory at Pride Park in the last round of fixtures kick-started their Championship campaign.
The Leeds faithful will hope their side push on now that the international break is over and, with Dallas in particularly high spirits, there’s every chance they will do so against his former club on Saturday afternoon.