Former Inter Milan goalkeeper Julio Cesar hailed the performance of Andre Onana in victory at Porto.
Onana made several saves for the 1-0 Champions League win.
Julio Cesar said: "Onana made three exceptional saves. He was very reactive in Porto's big chance in the second half, he gets back up really quickly.
"When you make a double save like that, he brings a lot of confidence. Inter went to get this boy because they knew his qualities. He had a period of adjustment, now with these performances he confirms the club's choice.
"(Romelu) Lukaku? He showed today that he's really in excellent shape."