The Italian will eventually cut the group down to 23 for the match at Wembley next Wednesday.
“It has all happened so quickly,” said Jones. “I am 19 and I did not expect so much to occur at such an early stage of my career.
"I am just riding the rollercoaster at the minute and enjoying everything. I did play every week at Blackburn and want to do the same at United. But I am a realistic person and I know that is not going to happen with the quality of player we have here."
The fixture has been criticised by Premier League managers, including Kenny Dalglish, for taking place three days before the start of the new Premier League season.