Smalling, who came on as an 82nd minute substitute on his return from injury, is not worrying what the repercussions could be to Tuesday night's result at Old Trafford.
"It was a disappointing one because we'd done so well to get ahead even though it was a difficult game," he admitted to MUTV.
"To concede straight away was gutting and we've given ourselves work to do in Switzerland now. It's been close in the group and you can see a lot of teams vying for top spot but hopefully we can do the job in Switzerland. Whoever you get in the next stage is a tough game anyway and you've got to beat them along the way. We just need to make sure we're there.
"Last year was one journey and hopefully this one can go on just as long. We have lots of games beforehand and, when that week comes, all out attention will go towards that Basel game. I think United always usually qualify and I don't see us not qualifying."