Ferreira can operate on either flank has been a regular fixture in Chelsea's reserve team since joining from Sporting Lisbon in 2005.
He told the club's official website "I am very happy to sign for this month. It will be a very good experience for me and I hope to be here for the rest of the season.
"The lads have been very friendly to me (when I was on trial) so hopefully I can win some points for the them".
Although Ferreira is not available for Saturday's game against Yeovil Town, he could be in contention for the next game against Bristol Rovers.