The 20-year-old striker returned from an ankle injury in a behind-closed-doors friendly against Yeovil Town on Thursday and is hoping to make an impact at the Welsh club
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But Cornelius made his return from an ankle problem by playing an hour in a behind-closed-doors friendly against Yeovil Town on Thursday.
And the Denmark international says he is now ready to make an impact at the Cardiff City Stadium after a stop-start beginning to his Cardiff tenure.
"It's always hard to watch your team play when you're not able to play and you want to contribute and do the best you can," he told BBC Sport.
"When I knew it would take a long time I was a bit frustrated but I've learnt a lot from it and done a lot of work in the gym.
"Hopefully I'll get back stronger than before. I played in a friendly with no problem so it's getting better."
Cardiff host Manchester United in their next Premier League encounter and Cornelius hopes he can be involved.
"I hope to be involved [this weekend] and I'll just try and work hard this week and show that I'm ready to be involved," the 20-year-old added.