The news follows the announcement that Portsmouth will be allowed to begin the season on zero points until the club can come out of administration.
Kieran Djilali, Mustapha Dumbuya, Jon Harley, Brian Howard, Izale McLeod, Lee Williamson, Jack Compton, Luke Rodgers and Liam Walker have all signed one-month contracts. Simon Eastwood, who played against Plymouth on Tuesday, also signs after originally playing on a non-contract basis.
Brian Howard will take on the role of captain at the club. The midfielder has been at Reading for the past three seasons and spent time on loan at Millwall last season.
Lee Williamson joins from last season's play-off finalists Sheffield United, dashing the Blades' hopes he would sign a new deal at Bramall Lane.
Former Chelsea and Fulham man Jon Harley spent last season played at Notts County.