Blues could bring in midfielder Alex as cover for Nemanja Matic
Reports indicate Chelsea are taking a close look at Alexander Song.
The midfielder is currently on loan at West Ham United from Catalan giants Barcelona.
However, Song is unlikely to return to Spain at the end of the season, when the deal expires.
And the Hammers are toing and froing with the idea of bringing him in on a permanent basis.
Song is thought to want to stay in England, and is wanting Champions League football.
Chelsea are said to be seeking cover in midfield for Nemanja Matic, and see Song as a good fit.
Although not desperate to sign him, the Blues may bring him in to avoid competition for his signatur from Liverpool and Manchester City, who are also keen.
Song, however, would prefer to stay in London. The only other viable option is Arsenal, but they are reportedly not interested in bringing Song back to the Emirates Stadium.
So this leaves Chelsea in pole position for Song, who retired from international football earlier this year, with 49 caps for Cameroon.