The lenders are concerned about SpiceJet's cash flows and have held discussions seeking assurances from the Indian budget carrier, as it is behind on payments to some aircraft lessors, the sources said.

SpiceJet said that no bank has put its account on high alert.

"Loans are being serviced as per the agreed terms. We are not aware of any bank having any 'concern' nor has there been any communication regarding the same to SpiceJet," a company spokesperson told Reuters in an email.

The banks did not immediately respond to Reuters' requests seeking comment.

(Reporting by Nupur Anand in Mumbai and Aditi Shah in New Delhi; Additional reporting by Jamie Freed in Sydney; Editing by Miyoung Kim and Louise Heavens)

By Nupur Anand and Aditi Shah