Borussia Dortmund midfielder Shinji Kagawa is being linked with a return to England.
German media sources say Kagawa is a summer target for West Ham.
The 29-year-old would cost around €13m for the Hammers, having struggled for consistency during much of his time back at Dortmund since returning in 2014.
Kagawa had three years at Manchester United before being sold back to BVB - when West Ham boss David Moyes was in charge.
The midfielder is also attracting interest from Turkey.