Jermain Defoe: Sunderland reject West Ham's £6m bid for striker
Sunderland have rejected West Ham's £6m bid for striker Jermain Defoe.
It is understood the Hammers will raise their offer for the player who began his career at the east London club.
Defoe, 34, has scored 11 goals in 21 appearances for the Premier League strugglers this season.
His latest goals came on Monday as Sunderland twice fought from a goal down to draw 2-2 with in-form Liverpool, which left manager David Moyes's side in 18th position.
Defoe's senior career began at West Ham before he moved to rivals Tottenham in a £7m deal in 2004, with striker Bobby Zamora going the other way. A £7.5m move to Portsmouth followed in January 2008 before he returned to Spurs the following year for £15m.
Defoe made a surprise move to Canadian team Toronto FC in 2014 before he was lured to Sunderland in 2015 by former Black Cats boss and ex-Spurs team-mate Gus Poyet.
BBC Radio 5 live's chief football correspondent Ian Dennis
West Ham will return to test the resolve of Sunderland, but it's unthinkable the Black Cats can afford to sell Defoe given their precarious position.
David Moyes recently described Defoe as "priceless" and his goals will be the difference as to whether they can preserve their top-flight status.
Premium and proven goalscorers are in short supply which is why West Ham themselves are looking at the 34-year-old.
They say money talks but Defoe is invaluable to Sunderland's cause.