The youngster fired Barca to victory in the Audi Cup and went on to score their only goal in a 2-1 defeat to Manchester United on Saturday.
“Thiago is currently going through a phase where everything he touches turns into gold. Every shot he takes seems to end up in the net at the moment,” Guardiola told EFE.
“But we have to go little by little with him. He’s a first-team player so he must have qualities.
“Nevertheless, he’s still young and has a large margin for improvement and is constantly getting better.”