Castres upset Racing 92 19-14 and book a Top 14 final against Montpellier.

A star-studded Racing side who finished second in the regular season and lost the European Champions Cup final to Leinster were clear favourite in the semi-final contest.

KEO.co.za reports, Racing had a try ruled out in each half but, despite outscoring the underdogs two tries to one, were unable to find the killer blow.

Racing peppered the line and had a series of close-range scrums in a dramatic finish, but Castres held firm for a fine win.

Castres will take on regular-season table-toppers Nemani Nadolo’s Montpellier at the Stade de France next Sunday in their first Top 14 final since 2014, having won the title the previous year.