The 24-year-old scored the only goal of the last-16 first leg in Germany, but he was forced off in the latter stages of the contest through injury.
Speaking after the match, Brahim told reporters: «I feel good, I think my injury is not serious.»
Ancelotti also had his say on the situation, with the Italian confident that the Spaniard only suffered a knock and not a muscular problem, which would mean a spell on the sidelines.
«Brahim took a knock on his ankle and the calf, they'll assess him tomorrow. I don't think it's a muscular issue,» the Italian told reporters in his post-match press conference.
«I have a squad with a fantastic attitude, immense commitment and quality. I was very impressed with how we defended against a team that will always make life hard for you at home. We could have scored more but we could have conceded too.
»It's a slight advantage and we'll have to make the most of being at home in the second leg, but we'll have to show the same attitude we did today.
«Leipzig are a good attacking side and they're well-organised with their wingers coming inside, while they've got two very good and different types of striker. Keeping a clean sheet is great and it shows we did a good job.
»We struggled with the positioning of their wingers in the first half but we sorted it out later on. Even so, having to dig in was to be expected here.
«The team is in good shape. Today was a pretty tough test in that sense because Leipzig played with such intensity. We almost always played in a low, compact block because we wanted to ensure they
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