The 23-year-old Trinidad and Tobago international will consult a surgeon once again over knee ligament damage with his club hoping an operation will not be required.
Knee injury: Sunderland's Kenwyne Jones could need an operation
Keane said: 'Clearly there is knee ligament damage, but we are hopeful.
'We've got two or three weeks to play with yet but it would certainly rule him out for the first month or two whatever happens.'
Jones was injured during the friendly clash with England on June 1 at Port of Spain when he was involved in a collision with goalkeeper David James.
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Duchess of Cambridge is pretty in pink at her first Buckingham Palace garden party
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