Meanwhile, any specific needs Thompson sees might be more likely filled via free agency.
While Thompson has a reputation for disdaining free agency - he signed only backup cornerback Frank Walker last year - it's somewhat unwarranted.
Just two years ago Thompson made multiple major free-agent signings, bringing in defensive tackle Ryan Pickett and cornerback Charles Woodson to add to the veteran core of the team, and a franchise can only make big free-agent splashes so often.
McCarthy added that the team was very active in pursuing free agents last year, but just wasn't able to sign any other than Walker.
Still, Thompson does consider free agency a high-risk, high-reward proposition, and a potential free-agent target would have to be viewed as an immediate and definite upgrade over what's already on the roster.
"This is an area where you would attack a specific need, if we felt like there was one there," Thompson said. "At the same time you don't want to necessarily bring somebody in that's just going to get in the way of somebody else that you think might be a player, some of these young core guys."