According to the Daily Mail, the Premier League duo have both watched the 21-year-old striker and are being linked with January moves for his services.
Frenchman Haller has scored 10 goals in 15 Eredivisie matches this season and the Canaries are reportedly prepared to offer £6.5million to land him.
The Black Cats are also keen but are not as far advanced in their talks as the Norfolk club.
It is also suggested that Dutch giants Ajax are watching Haller closely.
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