"This is not the best time to face Sporting. This is not our best moment and this is also the first group stage match. But hopefully we can get the result we want."
Queiroz is not the only United representative returning to face their former team. Both Cristiano Ronaldo and Nani are ex-Sporting graduates and Queiroz says it will be an important occasion for the Reds' Portuguese clan.
"Of course it will be a special feeling playing against Sporting, as it will be for Nani and Cristiano Ronaldo," he insisted.
"But we are all professionals and I am sure we will do our best. I hope we can play a tremendous game and I'm sure the Sporting fans are expecting this."