orwich and Sunderland have checked on Sebastien Haller of Utrecht.
The 21-year-old striker was the subject of a failed bid from Brentford last summer and has gone on to score 10 goals in 15 Eredivisie games.
Norwich are understood to be willing to offer £6.5m for the France Under 21 international and Utrecht will sell, however, they anticipate interest from Ajax, who Utrecht beat on Sunday, and they are understood to be Haller's preference.