The 27-year-old has been omitted from Alan Pardew's previous six matchday squads despite being fit for selection.
The Magpies have won five of their last seven Premier League encounters - including a 1-0 victory away to Manchester United - and the player's agent, Willie McKay, says that Joe Kinnear may facilitate a temporary move away from the club for his client.
Speaking to Sky Sports News, McKay said: "He has not been involved for the last six games and of course it is frustrating.
"Steven fully understands that the team have been on a good winning run and the manager does not want to change a winning team.
"Joe Kinnear has promised Steven a new deal in January and he could be made available for loan if he is not going to be playing for Newcastle."
Pardew's men were held to a 1-1 draw with Southampton at St James's Park on Saturday.