Raya, who suffered a serious facial injury in a clash with Baggies striker Jay Rodriguez, has been given dispensation to spend the next few days with his family back home in Spain.
Upon his return, the 23-year-old goalkeeper will see a specialist, who will make a further assessment on his fractured nose once the swelling has died down.
Captain Mulgrew is set to undergo a second scan on the rib injury that forced him off after just 16 minutes at The Hawthorns.
Following an initial scan, Rovers are pleased to report that results have shown that the Scotland star has not suffered a fracture.
Rodwell was replaced in the second half after suffering a back spasm, but the condition has now settled down and Rovers are hopeful that the former England international should be available for Saturday's Ewood encounter against the Hoops.
The club were given a further injury boost, as midfielder Jacob Davenport played 90 minutes - and scored - in the Under-23s' 2-1 victory over Liverpool at Leyland last night, whilst right-back Ryan Nyambe also came through 65 minutes unscathed.