Steven Davis is hoping to kick-start his season against Sporting Lisbon on Thursday night after admitting he has not met his own high standards so far.
The midfielder has consistently been one of Rangers' strongest performers since his arrival at Ibrox but knows he has not managed to match the levels he reached in previous seasons this time around.
With Rangers short on midfield options for Thursday's Europa League tie in Lisbon, 26-year-old Davis is now determined to return to his best.
He said: "I haven't really hit the heights that I have done in previous years and I think there is definitely more to come from me.
"I'm my own harshest critic at times and I always expect more from myself no matter how I play."