City overcame record 13-time winners Real 4-2 on aggregate to progress to the quarter-finals.
Gabriel told BT Sport he worked hard to be like two-time Brazil World Cup winner Ronaldo.
"His quality is different from me but I have to work to be a great striker," he said.
"Real Madrid are such a good team, they have a lot of players. They can beat us which is why we came to the pitch to work hard again.
"We have to keep working and stay strong for the next game."