The 28-year-old is currently out of the Aston Villa first team with an Achilles injury and, if the deal gets the nod, then he may well have played his last game for the Midlands club.
West Ham are in a desperate position at the foot of the table and boss Avram Grant has recently pleaded for as much at £10million to be handed to him so he can urgently add to his squad in the new year.
Sidwell, who joined Villa from Chelsea in 2008, is out of contract in the summer and Villa would rather see him go for a fee next month rather than walk away for nothing next summer.
Hibernian head coach Neil Lennon claimed referee John Beaton failed to protect his players from 'disgraceful' challenges during a 1-1 draw with St Johnstone.
St Johnstone manager Tommy Wright has accused Neil McCann of deflection tactics as he denied reporting the Dundee boss to the Scottish Football Association.