The squad are usually in for training on December 25 but this year the new boss allowed for some flexibility.
His generosity didn’t produce the desired result as the Minstermen went down 5-1 at out of form Darlington on Boxing Day.
The result leaves City in 14th in the National League North - seven points off the final play-off place and six points above the drop zone.
Collins told the York Press: “When I see my team get rolled over like that, it hurts a lot.
“They were a really young team, whereas we have plenty of experience in our side and it worries me in terms of what our players did on Christmas Day.
“I can’t understand for the life in me why we were so flat, and I’ve got to get to the bottom of that.
“I feel let down, very angry and frustrated.
“The Darlington lads probably had the same schedule, but they looked full of energy and wanted to have a fight and get on the ball and play.
“The goals we conceded were also totally unacceptable, coming straight down the heart of the pitch.”