Six of ATK's 14 Indian players missed out on the high altitude training in Los Angeles de San Rafael ground in El Espinar, Sergovia as their respective clubs East Bengal and Mohun Bagan did not release them as the local league was underway.
That meant Mondal, Bikash Jairu, Lalrindika Ralte, Robert Lalthlamuana, Abinash Ruidad of East Bengal and Prabir Das of Mohun Bagan missed the training under the new coach Jose Molina, a former Spanish World Cupper.
The India defender, who represented ATK in the previous two seasons, rued that they have to play back-to-back matches in some tournament or other with little time for recovery.
"Our calendar is made such a way that we have to play back-to-back matches -- Calcutta Football League Premier Division, ISL, I-League -- apart from national commitments. We can't do much about it but to live with it," the ISL inaugural edition winner said.
"Thankfully, we have got a big pool of 25 players so the option for rotation is there. We have a few days time and I will have to quickly adjust myself to the new set up."
The inaugural edition champions kick off their campaign against holders Chennaiyin FC at the Rabindra Sarobar Stadium on October 2.