Souness and Grealish have traded barbs in the media this week.
And the Scot wrote for the Daily Mail: "There are very obvious upsides that come along with a big move in football. A lifestyle beyond your wildest dreams. Glamour you could never imagine, playing for a huge club.
"The downsides, if you want to call them that, are the pressure and the scrutiny and the need to be bang at it — all of the time.
"These are not downsides at all if you're a proper player because you know the deal and what people say won't impact on you. But if you transfer for a huge fee like that, there's an expectation. To Grealish, I would say: 'Live with it. Deal with it.'"