The 18-year-old is one of the most sought-after youngsters in world football.
He has, however, spent his club career to this point turning out in the Italian second tier.
That grounding has served him well, and Brescia will be among the elite in 2019-20.
Tonali has helped them to promotion into Serie A and is expected to stick around regardless of the interest expected to be shown in him.
That is because enigmatic owner Cellino has no intention of parting with a prized asset in the next transfer window.
He has told Radio Rai: "Tonali needs to grow, Brescia is the best place to do it.