20-year old Lynch who made his debut in Crewe's 4-3 win over Tranmere Rovers has now found himself out on loan for a month.
The former Coventry City left back joined the Railwaymen during the summer after imperssing during pre-season. He was given a one-year deal and was cover for Billy Jones who incidently is out until February with a knee injury.
Birmingham born Lynch has signed before the deadline and will feature against Stevenage Borough at Martson Road tomorrow.