The Black Cats boss has rejected advances from another manager for the services of Irish number one Keiren Westwood because he does not have sufficient back up
The Black Cats boss said that he had received an enquiry about the 28-year-old custodian, but indicated his reluctance to sell because of a lack of back-up options.
"A manager did ask me about Keiren a few days ago, rang me manager-to-manager, which seems to be very rare these days – and I just had to tell him we couldn't do anything," O'Neill told the Irish Times.
He added: "My situation is that I have a very good goalkeeper in reserve, but it is hard to drop Simon Mignolet when he is playing so well.
"The fact is I'm very reluctant to let anyone go because we simply don't have the back-up. But Keiren clearly wants to play some games, of course he wants to play," concluded the Sunderland boss.
Republic of Ireland international Keiren arrived at the Stadium of Light from Coventry in 2011 but has not made one league appearance this season.