The Welsh international midfielder and former Arsenal star, who signed a four-year deal in February worth a reported seven million euros ($7.9 million) a season, came on for Federico Bernardeschi in the 70th minute of the game in Trieste.
"This was a very proud moment for me to put on this famous jersey," said Ramsey who hadn't played since April due to a hamstring injury.
"I am happy that I got a few minutes out there tonight. I have been working hard to get back fit and hopefully now I can stay fit.
"I know I haven't had the minutes on the pitch, apart from tonight, but I feel good physically. It will take a few games to get there."
Ramsey won three FA Cups in his 11 years at Arsenal and played a key role in Wales reaching the semi-finals of Euro 2016.
"I am really excited to be a part of it and experience the Italian league," he continued.
Man City land Cancelo as Danilo joins Juventus
"We start now on Saturday, so I am looking forward to that and playing my first competitive match."
Portuguese star Cristiano Ronaldo did not make the trip to north-eastern Italy because of muscular problems, while coach Maurizio Sarri was also absent because of flu.
A stunning Paulo Dybala goal after 38 minutes was enough to seal a win for the reigning Serie A champions.
The Argentine, who has been linked with a move away from Turin, celebrated wildly but then missed a penalty in the second half.
Ramsey, meanwhile, threatened with a quick one-two with Gonzalo Higuain, back from a loan spell to Chelsea, but sent the ball just wide of the goal.
Juventus begin their quest for a ninth consecutive league title at Parma on August 24.
COMMENTS
Comments are moderated and generally will be posted if they are on-topic and not abusive.
For more information, please see our Comments FAQ