The 22-year-old, who only joined Town in June, had fallen down the pecking order after the recent arrivals of Ben Wright and Richard Brodie.
Crawley boss Steve Evans said: "Liam is desperate to play football and this loan move should facilitate that. He is joining up with a good manager."
He added: "Obviously we will measure his performances very closely, he is still a player we like so lets see how he performs."
Source: BBC Sport
