The 34 year old will be available up until the Reading game on April 17th, after which we have a choice of extending his loan further or he'll return to Leicester.
Hignett has played 6 games since joining on loan in February but is yet to score and any expectations fans had of his return never materialised. With his contract up at Leicester this summer then he may be playing for a new contract at Leicester, or elsewhere - maybe at Crewe.