The Sun says Cardiff are ready to make a £2m offer for Maja.
But Sunderland want £4m for their striker, who has banged in 16 goals this term.
Maja, 20, is out of contract at the end of the season and has rejected the offer of a new deal from the League One club.
They also know they risk losing him for minimal compensation in the summer so are willing to cash in on him now.
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