Mark Bloomfield worked with Mother Teresa in India, setting up camps where doctors could perform cataract surgery and opened schools for girls.
The Indian government has ordered an inspection of all child care facilities run by the Missionaries of Charity.
"One woman has now been placed under arrest and we have strong evidence against a nun in detention and she too could be arrested soon."
'Mercy was the salt which gave flavor to her work, it was the light which shone in the darkness of the many who no longer had tears to shed for their poverty and suffering,' pope says.
The boxing icon died on June 3 aged 74.
Leader of Hindu organisation criticised for saying Catholic nun tried to convert poor to Christianity.