West Ham are poised to make an improved £5million offer for Leeds United striker Ross McCormack on Monday. Leeds have rejected an initial proposal of £3million plus and extra £1m on appearances and the Upton Park club will return with £4m plus £1m. Leeds are willing to accept that as talks continue over a takeover from Cagliari businessman Cellino. Scotland international McCormack is the Championship's leading scorer this season with 17 goals, one more than Jordan Rhodes of Blackburn. The 27-year-old was also made Leeds captain just last week. Leeds chairman Salah Nouruddin said on Twitter last week: 'I'd like to reassure all £lufc fans that we're working hard for the club and can confirm we've rejected an offer from West Ham for Ross.' West Ham are third from bottom in the Premier League with 18 points, the same amount as the two teams below them Sunderland and Cardiff, and one behind Fulham and safety.