Having impressed at the Hawthorns last season, the former Manchester United number one is targeted by the Baggies as their long term goalkeeper.
The 29-year-old was West Brom’s number one last season missing just one game in the Premier League helping the side retain their top flight status, whilst claiming the club's player of the year award.
If the Hawthorns outfit fail in their attempt to sign Foster they may look to sign Koln goalkeeper Michael Rensing following their relegation from the Bundesliga.
Lee Clark, new manager of Birmingham, revealed on Wednesday that negotiations between the two Midlands clubs are still “on-going”.
However, Birmingham’s other goalkeeper Jack Butland, who went to Euro 2012 with England, is also on the radar of Premier League clubs with newly promoted Southampton reportedly interested.