Redknapp sees other opportunities for the England U21 player, who targeted 12 first-team appearances for Rangers after he arrived in January's transfer window.
Redknapp said: "Will cramped in both calves and it might have been a bit of nervous tension. Maybe, he was a bit uptight before the game.
"He did OK, and there is more to come from him."
For breaking stories and all the great banter like us on Facebook: facebook.com/tribalfootball