Parkinson pointed out the need for reinforcements, alluding to the brutal scheduling that defines the Championship, midweek matches crammed between weekend games, often with little rest.
"Having the ability to freshen the team up as well. Because with the International breaks in the Championship, you've got a lot of midweek games," he said.
"You're going into a tough game on Saturday, then you go on to Tuesday, with very little difference between the teams in the division. You're not playing an Ipswich and then the next week a lesser team, where there's going to be a great deal of difference in the standard of the game. Making sure the energy levels are there in the team, but having the ability within the squad to make four or five changes to keep the freshness in the team."
Parkinson also acknowledged the team's growth over recent years. From a side that initially relied on spirit and momentum, Wrexham have developed into a unit that can compete technically and tactically.
"If you look at the story of the team, the people who watch the games, we have evolved as a team," he said.
"As you go up the divisions, the playing field gets levelled and you come up against squads that at times, even last year [in League One], had more talent than us. So we have to find a way how we're going to adapt. And that's going to be more prevalent in the Championship."