Manchester United

Premier manager Jose

LeCQUe Mourinho and his Manchester City

adversary Pep Guardiola rekindle a rivalry

20 years in the making in this weekend's

hotly anticipated Manchester derby.

Friends who became foes, Mourinho and

Guardiola represent opposite ends of football's ideological spectrum and their ongoing grudge match has shaped the game's recent history.

It is three years since they last shared a touchline and

Saturday's clash at Old Trafford marks the resumption of a duel that could determine the outcome of the Premier League title race.

Though renowned for their different demeanours, the pragmatic Mourinho, 53, and

the idealistic Guardiola, 45, have both shown a capacity for ruthlessness in their early days in Manchester.

Mourinho has sidelined experienced German midfielder Bastian Schweinsteiger, while Guardiola's benching of Joe Hart forced the popular goalkeeper to leave City forTorino.

Both men have also delivered impressive initial results, leaving their clubs neck-and-neck on nine points - along with Chelsea.

It is two decades since their paths first crossed at Barcelona in the mid-1990s, when Guardiola was captain and Mourinho worked as an assistant to Bobby Robson andLouis van Gaal.

The pair became close, but they found themselves in opposition at Camp Nou in 2008 when Barcelona went in search of a

successor to Frank Rijkaard as manager.

Despite Mourinho's stellar achievements with Porto and Chelsea, he was overlooked in favour of the inexperienced Guardiola.

The Portuguese exacted sweet revenge two years later when Inter Milan knocked defending champions Barca out of the Champions League.

In an iconic image, Mourinho raced across the Camp Nou pitch in celebration, his right hand provocatively raised in the air.

Mourtnho s appointment by Real Madrid that year brought him into regular confrontation with Guardiola.

Mourinho's first Clasico ended in a humiliating 5-0 defeat and during a sequence of four encounters in two

weeks later that season, the rivalry between the men turned ugly.

In the build-up to their Champions League semi-final, Mourinho's acerbic comments prompted an angry, foul-mouthed response from the usually placid Guardiola.

That year's Spanish Super Cup witnessed a new low in the relationship between the clubs as Mourinho poked Guardiola's assistant Tito Vilanova in the eye during a touchline shoving match.

They last met in 2013 when Guardiola's Bayern Munich edged Mourinho's Chelsea on penalties in the UEFA Super Cup.