Crewe manager Dario Gradi has made enquiries about bringing in a defender on loan.
The Alex need to shore up their back-line having conceded 17 goals while losing five out of their last six league games.
Gradi told the club's official website: "We did have one lined up but he was injured and that fell through.
"We've checked on his fitness and have also placed a phone call with the same club about someone else. It is a name that has been mentioned to us so we'll have to see if he's available. If he is then it is something we will follow up."
Crewe should soon be boosted by the expected return of Mat Mitchel-King following a back injury.