Chester have enquired about Tranmere duo Kevin Ellison and John Achterberg. Midfielder Ellison, 28, made 30 appearances for Chester in 2004 before joining Hull for �100,000.
Long-serving Rovers keeper Achterberg, 35, has suffered an injury-hit season but is a target of new Chester boss Bobby Williamson.
Chester chairman Stephen Vaughan said: "Bobby's identified Kevin as a player who would improve our squad so I have made an approach to Tranmere."