 Complete the following phrase:  Vieri started playing in the Fiorentina youth system before being loaned to Prato during the 196465 season, where he scored 11 goals in 24 matches and caused interest by Sampdoria of Serie B. He played for Sampdoria, both in Serie B and Serie A, until the 196970 season, when Juventus signed him for a then-significant 800 million ITL bid, plus Francesco Morini and Romeo Benetti. The next year, Vieri moved to A.S. Roma. During the 