Florian Thauvin received stick from Newcastle fans for his display at the weekend.
Florian Thauvin's first taste of the FA Cup ended in misery, taken off injured late against Watford.
He was even jeered by a section of the support as he was withdrawn, having failed to make an impact in the defeat.
Manager Steve McClaren has told The Guardian the club are right behind the summer signing, and believes he needs the support.
He said: "We all have sympathy with Florian. It’s tough for him but we’re sticking by him.”
Thauvin is out of this evening's Premier League game against Manchester United, and faces a fortnight on the sidelines.
McClaren's comments suggest the former Marseille ace has fragile confidence and is feeling the disappointment of injury and defeat, with the side adding a cup exit to their unwanted league status of 18th place.
A big performance is needed against Manchester United, but a result rather than a silky display is more important.
Thauvin, 22, has struggled since signing, making only three Premier League starts and 10 substitute appearances. He is yet to score or provide a single assist, and is looking so far like the Remy Cabella of last season.