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.
Inter Milan stretched their lead at the top of Serie A to 10 points on Friday after cruising past sorry Salernitana 4-0 ahead of their Champions League clash with Atletico Madrid.
"(Atletico) are taller and they took advantage of that," noted Ancelotti.
Defeat snapped Madrid's 21-match unbeaten run.
"These moments can only be experienced here. All of us who played gave our all," said Brahim Diaz.
Antoine Griezmann became Atletico Madrid's all-time standalone top goalscorer with 174 goals after netting against Real Madrid in the Spanish Super Cup semi-final on Wednesday.
Real Madrid defeated Atletico Madrid 5-3 after extra-time in a pulsating battle in Saudi Arabia to reach the Spanish Super Cup final on Wednesday.
Los Blancos take on Diego Simeone's Atletico on Wednesday in Riyadh in the Spanish Super Cup semi-final, again next week in the Copa del Rey last 16, and also in La Liga in early February.
Atletico Madrid progressed with a 3-1 win at third-tier Lugo after Memphis Depay struck twice, while Real Betis were knocked out in a 1-0 defeat by Alaves.
Girona coach Michel Sanchez insisted his team cannot keep up with La Liga leaders Real Madrid despite their stunning 4-3 win over Atletico Madrid on Wednesday to pull level in first place.
Who would win LaLiga 2023-24?