Harlequins v Castres predictions and rugby union tips: Visitors won't roll over

Harlequins are favourites to beat Castres.

Harlequins v Castres is on BT Sport 2 at 8pm on Friday.

Harlequins can secure top spot in Pool B with a bonus-point win on Friday. Quins have made nine changes to the team that secured a last-gasp win at Cardiff. The new format of the Champions Cup means that Castres can qualify for the knockout stages with victory. Tabai Matson has admitted that he has one eye on next week's Premiership action.

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