Roy Keane has delivered a scathing assessment of Jose Mourinho's first season as Manchester United manager.

Keane's former club play Celta Vigo on Thursday evening with a place in the final of the Europa League up for grabs.

Mourinho has admitted his team face a serious reality check if they fail to win the competition and qualify for the Champions League, but Keane insists the season has already been a huge disappointment by United's lofty standards.

Previewing Thursday night's second leg tie on ITV Sport, Keane said there would be 'no excuses' if United fail to win the Europa League.