Ole Gunnar Solskjaer believes Manchester United great Wayne Rooney will be a threat in Thursday’s FA Cup clash against Championship side Derby.

Rooney, United and England’s all-time top scorer, will line up against the club where he enjoyed so much success when lining up for the Rams at Pride Park.

Rooney joined the second-tier side as player-coach after a stint in the United States with DC United and former teammate Solskjaer is wary of the 34-year-old’s threat in the fifth-round clash.