Cahill believes Lacroix's experience at Palace and his performances at the World Cup, where France finished fourth, provide invaluable grounding to compete at the highest level.
Adding to his assessment of the defender, Cahill asserted: "I just think he's a great player, it's a really good signing, and a move that I'm sure he's really looking forward to getting stuck into and aiming to hit the ground running.
"I was at Palace for a couple of years, and I enjoyed my time there. He's done the same and he's progressed while he's been there.
"It's a big move for him, but also for the club and it will be exciting to see him come through the door and get started here."