Caio came off the Benfica bench late in the second half to score a stoppage-time winner in Benfica's 2-1 win against Fiorentina in the ICC.
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Eddie Nketiah continued his fine preseason form with two goals as Arsenal produced a 3-0 victory over Fiorentina in the International Champions Cup.
Giovanni Simeone and Riccardo Sottil scored as Fiorentina beat Chivas de Guadalajara in the ICC opening match.
Roma have pulled out of this year's International Champions Cup because of their "unforeseen involvement" in the early stages of the Europa League.
Rocco B. Commisso has completed the purchase of Fiorentina, acquiring the Serie A club from the Della Valle family on Thursday.
Italian Serie A club Fiorentina have confirmed their owners are negotiating a sale, amid interest from New York Cosmos owner Rocco Commisso.
Fiorentina and Genoa were jeered off the field after both teams escaped relegation with a dismal goalless draw on Sunday.
New York Cosmos owner Rocco Commisso is close to completing a deal to buy Serie A club Fiorentina for around $150m, according to ESPN FC sources.
A Hakan Calhanoglu goal gave AC Milan a 1-0 win at mid-table Fiorentina in Serie A on Saturday to keep them in the hunt for a Champions League spot.
Atalanta reached the Coppa Italia final for the first time since 1996 when an Alejandro Gomez strike gave them a 2-1 win over Fiorentina.
Juventus clinched an eighth-consecutive Serie A title with a 2-1 victory over Fiorentina, as they came from behind following a below-par first half.
Fiorentina's Supporters Association boycotted the opening 45 minutes of Sunday's home match with Bologna as a protest against the ownership.
Vincenzo Montella returned for a second stint as Fiorentina coach after the Serie A club named him as their replacement for Stefano Pioli.
Fiorentina have not made a decision over a new manager following Stefano Pioli's resignation, sources have told ESPN FC.