The Magpies welcome the Portuguese outfit to St James' Park knowing a victory will see them qualify for the knockout stages, but Pardew remains concerned with the size of his squad.
He said: "We are all concerned. It's not like it's just heaped on myself and 'Get on with it'.
"The managing director and the owner are very conscious of where we are and we are trying to make sure that we look at the period and events leading up to the next window, and we will react from there.
"I have been very fortunate to have a squad that has remained pretty fit and healthy since I have been here, and we have not really had much down time.
"We have had the odd result that didn't really go our way, but have rebounded very, very quickly. But this is the first time that we have lost a couple of games on the spin and we have lost so many players to injuries, and it's difficult.
"That's when you have to show your mettle and look to the squad and try to boost them and get a performance, and that's what me as a manager and my staff are trying to do."
The summer was a largely quiet one for Newcastle with only midfielder Vurnon Anita's arrival from Ajax a significant coup, but rumours suggest Lille's France international full-back Mathieu Debuchy is still in their sights.