The Ospreys will look to maintain their unbeaten PRO12 start when they host Ulster at the Liberty Stadium tonight.
The Irish side were beaten PRO12 finalists last season, but have had a mixed start to their campaign.
They are currently fourth in the table - with the Ospreys second.
The Welsh side have Lions stars Richard Hibbard, Adam Jones, Alun Wyn Jones, Ian Evans and Justin Tipuric in their XV.
Canadian flanker Tyler Ardron makes his first start for the Ospreys.
Ospreys Head Coach Steve Tandy said: "We are really pleased to be where we are in the table four weeks in and after three games on the road, but we aren’t going to allow ourselves to get carried away. There’s plenty of room for improvement."
"Ulster is as difficult as it gets. They’ve got a strong squad with world class players in there."
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Fine and dry at first but becoming largely cloudy with outbreaks of rain or drizzle.
First Minister Carwyn Jones says Wales must not get a bad deal in Brexit negotiations. He was speaking at meeting of British-Irish Council.
Isolated showers may last into the late evening, but a dry night.