The Union, who finished 14th overall in 2013, have already lost key midfielder Michael Farfan to Mexican club Cruz Azul and are yet to sign any new players ahead of the next campaign.
But Hackworth feels there is plenty of talent within the Union's youth and will only look to add a couple of quality signings to that rather than reshuffle the current playing roster.
"We have a plan that was put in place a while ago and we've built up some resources for players in terms of quality," Hackworth told the Delco Times.
" We would not be talking to these types of players, specifically foreign players bringing them into this MLS market, if we weren't willing to discuss the designated player option."
He added: "We feel we have a strong core of players and lots of guys who are young, and they give us as an organization some serious confidence going forward based on what they have done in past years in terms of their growth and development and who are ready to take it to another level.
"At the same time, you have guys who have veteran experience and success in the league. And combine that with the young guys who have gotten a ton of minutes, and we don't think we need to make major or wholesale changes. That can come off as, 'hey, they haven't done a lot.' But we're looking at specific targets, and it's quality over quantity."
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