West Ham are interested in Dynamo Moscow defender Douglas.
The USA tour for Barcelona ended on a sour note, after Brazilian right-back suffered a severe muscular injury, in the first-half of action against Chelsea.
Barcelona full-back Douglas says he wants to stay at the club.
Newcastle boss Steve McClaren could be engineering a reunion with centre back Douglas, according to reports.
Derby's Will Hughes, Hull's Thomas Ince, Fulham's Bryan Ruiz, QPR's Leroy Fer, and Dynamo Moscow's Douglas could all be strong signings for their former boss.
The Magpies pulled out of a deal for Brazilian defender Douglas back in 2013 and he showed the Premier League side what they missed out on this week.
Porto have reportedly eyed Barcelona's unused right-back Douglas as next season's replacement for Real Madrid-bound Danilo.
The Brazilian seems set to tie up a deal with PSG, leaving Barcelona to weigh up alternative options at right-back.
Everton are on the search for defenders in the January transfer window.
All the latest summer transfer rumours from La Liga...