Van Gaal is worried about Vidal's knee injury... that's why £47m move to United is being held up, claims Chile boss

Arturo Vidal's transfer from Juventus to Manchester United has hit a snag because of doubts about the Chilean's fitness, according to his national team coach.

Jorge Sampaoli, quoted in El Mercurio, says that United boss Louis van Gaal is wary of spending £47m because of the midfielder's problematic knee injury.

Vidal has been a long-term target for the Premier League side, with reports suggesting a move has been close all summer.