Born in Wilmington, Delaware, Tosi attended Salesianum School, playing football there on Saturdays and for the minor league Eleventh Ward Whitejackets on Sundays.
He started one game in Brooklyn before being released; he spent the following four seasons in minor leagues, retiring in 1943.
[2][3][4] Under coach Johnny Oakes with Salesianum, Tosi earned All-Catholic and All-Philadelphia honors.
Tosi said, "I flew out to Notre Dame to discuss a football scholarship the school offered.
He spent just one year at Fordham, playing guard alongside future Pro Football Hall of Famer Vince Lombardi.
[8] Tosi was sold to the Brooklyn Dodgers shortly before the Pirates' game against the Washington Redskins, after making just three appearances.
[11] He also played for two teams in minor leagues that year, making one appearance for the Paterson Panthers before going to the local Wilmington Clippers.
Tosi then retired, but in 1944, high school teammate Ed Michaels convinced him to make a return to football.
Following his football career, Tosi worked for 30 years at Sun Oil Company in Marcus Hook, Pennsylvania.