The Spain international spent two seasons in Turin, winning two domestic doubles and reaching the 2015 Champions League final, before Madrid activated a buyback option in his contract, reportedly valued at €30 million, in 2016.
Morata struggled to force his way into the starting line-up back at the Santiago Bernabeu, though, and agreed to join Chelsea in a reported club-record £60m deal in the transfer window in a bid to earn regular football.
The 25-year-old has enjoyed a strong start to his career in England, scoring six times in nine Premier League appearances, but he has confirmed he longs to go back to Italy. Morata also slammed Madrid's attitude towards him following his return and felt he was practically forced to restart his career.
Morata also believes Serie A is the toughest league he has played in due to the tactical and defensive strength of the teams.
"In Spain, technique is dominant. In Italy, it's tactics. In England, the most relevant aspect is physical strength," he said. "The most difficult is Italy: organised teams and very good defenders."