Newcastle go to the Nou Camp for the second-leg of their Champions League round of 16 tie with the score locked at 1-1.
Joelinton said: "It was a massive win away from home. We got a clean sheet, and there were a lot of positives to take, we showed a great mentality to get the three points.
"We're very happy with everything. Going to Chelsea has never been easy and it was my first time to win there. So it is a great feeling. We have had difficult games here but we got over the line and took the win. The guys that came in did a great job and worked hard for the team, showing that great mentality."
Joelinton says the away support could be key on Wednesday night.
He also stated: "It is something we always expect but this will be extra special. To see 10,000 Geordies in Barcelona is incredible.
"They will be very important for us. I hope we can deliver a good performance for them.
"I hope it is a good trip for everyone. We hope they enjoy it and we enjoy with them too. If we give our best we can give them a result."