He has quickly settled into life at Glanford Park, hitting seven goals already this season.
"I've been to see Martin play, sent scouts to watch him and I think he deserves his chances to come into the squad," said Worthington.
"He's been scoring goals regularly for Scunthorpe and will bring a real bundle of energy.
"He's a threat down the channels and I think it's nice that he has been included in the squad."