The Italian champions remain undefeated in the competition this season and sit fifth on 10 points at the midway point of the new league phase format.
"He's working well, he's training well... it's important for his growth. As long as there is humility, the heart always responds," Simeone told Movistar, while giving credit to Nahuel Molina's pass that led to Giuliano's goal.
Even a single point would have flattered Diego Simeone's side but they took all three when the Argentina international, on as a substitute, finished Antoine Griezmann's cross at the back post.
The European top-flight has switched from a group stage to a league phase where 36 teams play eight matches each, with the top eight in the table progressing directly to the next round, while the next 16 teams enter a two-legged playoff.
"It's amazing, to get a last-minute goal like this is always fantastic and it's good to give the fans something to cheer about," Atletico's former Leipzig striker Alexander Sorloth told DAZN.
Diego Simeone's Atletico Madrid shared an entertaining 2-2 draw with Villarreal as they began their La Liga campaign on Monday.
After a summer dominated by Spain, with La Roja storming to Euro 2024 triumph and their youngsters claiming gold at the Paris Olympics, the focus now turns to Spain once again as LaLiga kicks off on Thursday.
The 24-year-old Argentina international's exit marks a record sale price for City, eclipsing the 50 million pounds Chelsea paid for winger Raheem Sterling in 2022.
The 24-year-old cost City just £14 million when he signed from River Plate in January 2022 and his since enjoyed a meteoric rise, helping Argentina to World Cup and Copa America glory, as well as winning two Premier League titles and the Champions League at club level.
Barcelona forward Lionel Messi is available for selection for the weekend's game with Atletico Madrid after the birth of his second son Mateo on Friday night.
Real Madrid say they did everything they could to sign Manchester United goalkeeper David De Gea, after missing the deadline by two minutes.
Manchester United target Sergio Ramos has agreed to sign a new five-year contract with Real Madrid.
Chelsea sign Monaco striker Radamel Falcao on a season-long loan deal, with the option to make the deal permanent.