Barcelona No2 Jordi Roura says the coaching staff are fully behind their letter to UEFA.
Barca wrote to UEFA to complain about ref Wolfgang Stark's performance for their 2-2 draw at Champions League opponents PSG.
Roura said: "(Spokesman Toni) Freixa explained the club’s position in this respect. We fully agree with this letter to UEFA because we feel that a written law was not complied with … We are fully respectful to referees, but there are certain things that have to be said.
"These are very specific things regarding very specific matches.”