Other clubs are expected to follow.
Defender Mohammad Reza Khanzadeh, midfielders Ashkan Dejagah and Akbar Imani scored for Tractor in the first half.
"This is my duty to know my team's weaknesses since I don't want to waste my time," the Croat added.
THE HAGUE, Sept. 2 (Xinhua) -- Manchester United have signed midfielder Donny van der Beek from Ajax, both clubs announced on Wednesday.
Looking at the big five European leagues, the Bundesliga is the one with the most goals per game.
Bayern remains the league's flagship from an international perspective, the official underlined.
Photos of Bale in the stands in those games showed the forward looking bored and willing to show that boredom by appearing to be half asleep at times, knowing he would not play.
Speaking to Sky Sports while on international duty with Wales, Bale was asked about his future at the La Liga champions.
Klein is expecting the many young talents to continue their performance. He mentioned Dortmund's Erling Haaland as one of the examples next to Jadon Sancho.
In the 65th minute, Dalian's Ke Zhao added a goal of his own and sealed the 4-0 victory.
The 23-year-old Dutchman has signed a five-year contract at Old Trafford, with an option to extend by a further year. The transfer fee is 39 million euros (46 million U.S. dollars), which may increase to 44 million euros if certain clauses are met.