The 33-year-old midfielder, who is currently a free agent, having mutually terminated his contract with West Ham United in the summer.
The O's head-coach Ian Hendon confirmed the news: “It is great to have such a model professional in Kevin at the club, and I am more than happy for Kevin to come in and train with the squad. “It is good for our players to be training with a vastly experienced and talented Premier League midfielder."
ICYMI: Former West Ham skipper Kevin Nolan is training with the O's - http://t.co/jUyRLE3Ybg#LOFCpic.twitter.com/jCHx74q1LL
— Leyton Orient (@leytonorientfc) September 8, 2015