Malcom revelled in his goalscoring debut at Camp Nou, where the Brazilian starred alongside five-time Ballon d'Or winner Lionel Messi.
Barcelona won the Joan Gamper Trophy for a sixth year in a row, beating Boca Juniors of Argentina 3-0 at Camp Nou.
Roma have been busy in the transfer market, but Eusebio Di Francesco knows how difficult it will be to improve again this season.
Barcelona head coach Ernesto Valverde was impressed with Malcom's performance in Tuesday's loss to Roma.
Barcelona led 1-0 and 2-1 but Roma refused to surrender as Alessandro Florenzi, Bryan Cristante and Diego Perotti inspired a comeback.
Kostas Manolas was in no mood to discuss Malcom after the highly rated winger snubbed Roma in favour of LaLiga champions Barcelona.
Rafinha believes Barcelona's new midfielder Arthur is comparable to the club's legendary player Xavi.
Barcelona head coach Ernesto Valverde praised debutant and goalscorer Arthur following Saturday's shoot-out win against Tottenham.
Tottenham came from 2-0 down to force a penalty shoot-out but Barcelona prevailed thanks to Malcom in California on Saturday.
Malcom had his sights set on moving to LaLiga champions Barcelona, not Roma.