Muller wary of Scarlets threat in semi

Ulster captain Johann Muller believes the Irish side will have to be at their best to overcome the Scarlets in Friday night's Pro12 semi-final.

Ulster topped the league standings at the end of the regular season and they will start as favourites for the Ravenhill clash.

Muller also said that the season will be considered a failure if Ulster fail to secure the Pro12 title.

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