Brentford winger Sergi Canos is a loan target for Valencia and Anderlecht.
Meanwhile, Everton midfielder Stanley Mills has joined Oxford United on loan.
Canos spent the second half of last season on loan at Olympiacos and scored four goals in eight games, although he was affected by injury.
The 26-year-old has endured misfortune with injuries but in June Brentford opted to exercise their option to extend Canos' contract by a year.
After starting his senior career at Liverpool, for whom he made one first-team appearance, Canos went on to play for Norwich before joining Brentford.