(Reuters) - Sheffield United manager Chris Wilder says he is saddened by the impact the Video Assistant Referee (VAR) has had on football after the system awarded Newcastle United a controversial goal in their 2-0 Premier League win over his side on Thursday.Sheffield stopped playing when a linesman's flag indicated Andy Carroll was offside in the buildup to Newcastle's second goal as Jonjo Shelvey ran through to put the ball in the net.But VAR then reversed the offside call and ruled the goal..