Ulster's Nick Williams expects to face 'outstanding' Saracens

Ulster back-row forward Nick Williams says he anticipates facing an "outstanding" Saracens team in Friday's European Champions Cup Pool 1 game in Belfast.

The Premiership leaders thumped Toulouse 32-7 in their opening fixture on Saturday, while Ulster's scheduled game against Oyannax in France was postponed following the deadly attacks in Paris.

"Saracens were on top of their game in the win over Toulouse. You look for a weakness in their team but you struggle to find one," said Williams.