Manchester United goalkeeper Dean Henderson will extend his stay at the club until the end of the season.After playing a key role in their march to the Premier League last year, Henderson is enjoying another successful campaign on loan in South Yorkshire.The 23-year-old has been a vital part of the side that are holding their own in the upper echelons of the league and there have been calls for him to oust Jordan Pickford as England's first-choice goalkeeper.Henderson's loan deal doesn't expire