Mohamed Salah carries a "nuclear" threat to Manchester United when they face Liverpool on Sunday, according to Jose Mourinho.
Salah played under Mourinho at Chelsea, but his initial spell in the Premier League failed to catch fire and the former Basel man moved to Serie A.
He returned last season, joining Liverpool for £36.9million following spells with Fiorentina and Roma, and Mourinho acknowledged the Egypt forward has made considerable strides since they worked together.
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"He has developed incredibly well at every level," he told reporters of a player who is a key factor in there being a 16-point chasm between title-chasing Liverpool and their bitter rivals United.