Foster rejoined Conference Premier club Lincoln City on 1 August 2013, signing a one-year deal with the club he had previously played for from 2005 to 2007. He made his second debut for the club ten days after signing, on the opening day of the 2013–14 season, playing the whole match in central defence as Lincoln drew 0–0 away at Woking.
Foster rejoined Lincoln City on August 1, 2013, after previously playing for them from 2005 to 2007. He made his second appearance for the club ten days later in the opening match of the 2013–14 season as a central defender during a 0-0 draw against Woking.