Boss Dario Gradi has challenged trialist Richard Hinds to up his game and prove he deserves a contract with Crewe.
The defender is currently unattached but is hoping to impress Gradi after securing a trial with the Railwaymen.
But Hinds, who has a wealth of league experience with Sheffield Wednesday, Scunthorpe, Hull and Tranmere, will first have to prove he is better than those currently in the squad.
Gradi told The Sentinel: "Richard has to be better than the defenders I've got, so we'll see if he can do that.
"If I thought he was going to be better, we'd sign him now, but we need to see how he does first and I've not really seen enough of him yet.
"He is a tall centre-half and we certainly need some height."