Porro Played as being midfielder side view equipped with excellent ride, then you could add the SMF position and put the position SB as optional because in some games such as this:
http://www.gruppozeman.com/foggia-avellino-5-0-1990-91 he played as a right-back, as can be seen clearly from the tactical deployment of Foggia:
"FOGGIA (4-3-3): Mancini; Porro, Napoli, Padalino, Codispoti; Picasso, Barone, Manicone; Rambaudi, Baiano (65′ Caruso), Signori. All.: Z. Zeman.
AVELLINO (4-3-1-2): Amato; Ramponi, Vignoli, Franchini, Drago (30′ Gentilini); Celestini, Fonte, Voltattorni; Battaglia; Cinello, Sorbello. All.: F. Oddo. "