Barca allowed Mallorca to fight-back to 3-2 in the second-half before eventually winning 4-2.
"Mallorca scored its goals through isolated plays: a defensive error and a penalty. These things happen," shrugged Cesc.
"The team's reaction was positive and we managed to score the fourth goal without letting our nerves get the best of us.
"We hope none of the players pick up injuries during the international break. These matches aren't optimal, but we have to be professionals."