The 30-year-old left Upton Park during the summer on a free transfer following a seven-year stint with the Premier League outfit.
However, he was unable to agree terms with another club, which in turn has now seen him return to the Hammers.
Although there has been no official confirmation from either party, it is believed that the former England international has agreed a deal until January.
I'm a West Ham United Player again. Thanks for the support. pic.twitter.com/qitYKkGeep— Carlton Cole (@CarltonCole1) October 14, 2013