"I just had a quick contact with one gentleman from UEFA when I was looking at the pitch," Mourinho told reporters ahead of the game.
"And when I told him about my concerns, the gentleman told me the players are insured -- if something happens, no problem.
"It's hard for me to believe we are going to play on that field, if you can call it a field."
Mourinho, who has Zlatan Ibrahimovic available despite the striker's three-match domestic ban for violent conduct, and midfielder Henrikh Mkhitaryan back after a two-match absence, said the pitch had presented him with a selection dilemma.
"I don't know which team I will play, I don't know if Mkhitaryan is going to play," he added. "I have a lot to think because I was expecting something more playable."
After the Europa League tie, United return home to face Chelsea in the quarter-finals of the FA Cup on Monday.
(Reporting by Hardik Vyas in Bengaluru)
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