J.J. Watt might not have to find a new number in Arizona after all ...
Marshall Goldberg's daughter, Ellen Goldberg Tullos, tells TMZ Sports ... the legendary football player's family would have no issue unretiring the #99 for the newest Cardinals star.
In fact, Tullos says she believes her dad would have been honored for Watt to wear his old digits in Arizona.
"He has my blessings," Tullos said of Watt, "and I'm sure my father would be more than delighted for him to carry it on.