The 34-year-old has proved a hit since joining the Old Lady in a £99m transfer last summer after nine trophy-laden years at Real Madrid.
The Portuguese star recently fired the Serie A holders into the Champions League last eight with his eighth European hat-trick in the 3-0 win against Athletico Madrid.
Despite rumours Ronaldo’s move would unsettle things in Turin, the five-time Ballon d’Or winner has netted 24 goals in all competitions in his first season with Juve.
Speaking to YouTube channel De Sola, Costa said: “Believe it or not but when Cristiano Ronaldo’s arrival was being talked about, I asked ‘what will the dressing room be like?’
“We all have to love each other as team-mates because we’re all looking for a place in the team – but Cristiano won everyone over very quickly.
“He’s a simple, hardworking guy who likes to win. Juventus were looking for a player with his mentality, so he’s given us a lot.
“When he arrived. I thought ‘the best player in the world has joined, right?’. As soon as he arrived, the club improved in every aspect. His contribution has been noticeable.
“He scores goals every week, he’s brought more fans to the stadium and we hope to win things with him so we make history with him by our side.
“He’s a stand-up guy, he’s hard-working and he’s always with us.”
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