He's training like a young guy of 18 years old.
The England global still has 12 months left on his City contract, although he is not part of Pep Guardiola's plans at the Etihad.
"We spoke in the week about courage, intensity and a desire to play".
The former City striker told the Daily Star: "He's been a top player, he's done a great job at Leicester".
And it is reported that Hart's low price-tag of £5million appeals to Maurizio Sarri, with Chelsea looking to invest heavily in other positions after already capturing Jorginho for £57million.
Mourinho's men are also in the United States as they opened their pre-season with a 1-1 draw against Club America yesterday in Phoenix.
Sancho played the second half against the side he turned his back on in search of more senior football last summer and was one of Dortmund's brightest sparks during a 1-0 victory. If the days before they are exhausted and they don't want to fight for the Community Shield, play at Arsenal, then stay on holiday. The best thing with Guardiola, he improves players, he makes them better.
He last played for City in a Champions League qualifier against Steaua Bucharest in August 2016 having been axed by Guardiola following his arrival in Manchester two years ago.
"I know it's hard obviously because of the money that they've spent but it was going to take that type of money to get him out of there".
However, the Borussia Dortmund forward said he could not explain the absence of City winger Sane, who was not picked despite his outstanding performances in the Premier League.
He was one of Dortmund's brighter players and has been praised by head coach Lucien Favre, who described him as "an extremely good player" with "exceptional potential".