Swansea and Hull have been forced to admit defeat in their attempts to land former Manchester City forward Albert Rusnak.
The Slovakian had attracted interest from the Premier League duo, while Aston Villa were also keen on the 22-year-old.
But Rusnak has left Groningen for MLS side Real Salt Lake on a lucrative contract.
Rusnak has impressed in the Eredivise since leaving the Etihad Stadium in 2015.