official website has confirmed.
The ex-England international has found opportunities at White Hart Lane limited, and has not started a game for Spurs since April 2011.
With the likes of Moussa Dembele, Sandro, Scott Parker and Jake Livermore ahead of him in the pecking order, the midfielder has opted to move back to the City Ground on a month deal.
Jenas played for the Championship side before moving to Newcastle in 2002, and spent time on loan at Aston Villa last term in search of first-team football.
The player, who amassed 21 caps for his nation between 2003 and 2009, has joined on an emergency loan; it is rumoured in The Daily Mail that Forest will pay £15,000 of Jenas’ £45,000-per-week wages for the next month.
It is believed that Forest beat Leeds to the signing of Jenas, and that Elland Road boss Neil Warnock also wanted to sign the midfielder on a temporary deal.
By Gareth McKnight