Barcelona are set to change ticket policy for European games according to the club's president Joan Laporta.
This comes after Eintracht Frankfurt fans gained entry to Camp Nou on Thursday during the Europa League encounter. The Catalans were knocked out of the tournament following a 3-2 loss, 4-3 on aggregate.
Only 5000 tickets were allocated to Frankfurt fans by the Catalans but thousands more secured seats in the return leg of the Europa League last eight.
"We feel really bad, it was shameful," Laporta told Barca's website on Friday.
"I am appalled by the image presented and feel ashamed as this should never have happened.
"The club is not guilty regarding events leading to the tickets ending up in the hands of German fans. However, we do accept the responsibility that falls on us.
"We do not want this to happen again at Barca and we will take action: the measures that I can announce for now -- and that will be adopted for all international competitions -- is that tickets will become non-transferable.
"It is something we never wanted to do because it is inconvenient for fans who follow the rules. But we have no option to ensure that what happened against Frankfurt does not happen again."
The attendance at Camp Nou on Thursday was just under 80,000. Of those present, around 38,000 were season ticket holders, 5,000 were in the Frankfurt section and another 34,440 had bought tickets for the match through other means.