Pep's Barca was the smallest team in Europe in 2011, so not a concern. Let the others worry that their teams are more suited to rugby than proper football.
Bayern had a lot of dwarfs last season, too - especially when Kimmich and Alaba played central defenders. Müller and Lewy with their 1,86 m were the tallest then. Bayern did not get one goal with a corner last season... ;)