But Wanderers may need patience to land their reported target, especially with West Brom and Middlesbrough also interested.
Riga plays for Valencia-based Levante and his trying to get his contract annulled due to alleged non-payment of wages.
The Ghanaian-born star has taken his dispute to the Spanish FA in a bid to obtain a free transfer.
"The Premier League has always been my first target," he claimed.
Wanderers have paid a record £10m for Swedish international Johan Elmander.
But boss Gary Megson is still keen to bring in more back up for Kevin Davies.
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