Alun Wyn Jones says the Ospreys have not hit the panic button after the Pro12 champions first defeat to an Italian side.
The Ospreys suffered a 12-6 defeat byTreviso in Italy last Friday.
The reigning Pro12 champions had never previously lost to an Italian side in domestic or European competition.
"There are no big red buttons being pushed or anything like that," said Jones, the Ospreys captain.
"We have to pick ourselves up and move forward. It's the first game of the season."
The Ospreys played for more than half the match with 14-men when Wales lock Ian Evans was sent off on 31 minutes for two yellow cards - the first for interfering at a ruck and the second for a dangerous tackle at the Stadio Comunale di Monigo.
The Welsh side now play losing 2012 Heineken Cup finalists Ulster in their first home game of the new campaign at the Liberty Stadium on Saturday.
Wales and British and Irish Lions lock Jones admits the Ospreys cannot be as indisciplined and have to be more clinical when they host the Ulstermen in Swansea.
"We know where we are, what we need to do and where we are going," he said.
"We look at each other and don't worry about what other people are thinking about us.
"We will look around the room and realise what we have to do and move on.
"The beauty is that it is the first game of the season and there will be plenty more opportunities to put things right and gain momentum over the season."
The Ospreys will come face-to-face with a resurgent Irish province who spent four years in Swansea before returning to Ulster ahead of this season.
The Ulstermen also brought in number eight Roger Wilson of Northampton.
"We will concern ourselves about where we are in the table around Christmas time because we will be on the backside of the season then," said Jones.
"They [Ulster] have a lot of strength in depth and a lot of overseas players as well and they have shown their quality by getting to the Heineken Cup final."