Barcelona were on the receiving end of a 3-0 humbling at the hands of Benfica in the Champions League on Wednesday, meaning they have lost their first two matches of a European campaign for only the second time in their history.
Barca finished the game with 10 men after Eric Garcia was shown a second yellow card for a foul on Goncalo Ramos. The Catalan giants have now lost four of their past five Champions League games, conceding 14 goals in the process.
Calls for Koeman to be relieved of his duties will surely intensify after another disappointing result, but Busquets believes the fault does not lie solely with him.
"It's the easiest thing in the world of football [to sack the coach], but the responsibility also belongs to the players. We are in a critical situation," Busquets told Movistar.