The food critic, 51, was announced by the BBC as Gregg's replacement in December after he was axed due to a series of complaints about his alleged behaviour.
Restaurant critic Grace, 51, is set to step in to judge the next series amid an external review into historical allegations of misconduct that have been made against Gregg.
It was announced on Tuesday that Dent will judge the next series of Celebrity MasterChef alongside Torode amid a storm of sexual misconduct allegations against Wallace.