United were held to a draw by their Portuguese opponents in the Champions League, which leaves them still needing at least a point away to Basel to make it to the last 16.
But striker Hernandez isn't worried.
"Now we have to think only about Newcastle on Saturday in the Premier League. It's a very important game. We need to think about them straight away. We have had worse moments than this one and we will come back - we are very positive and very confident."