The game's referee, Juan Martinez Munuera, released the following report after the contest, per Chris Davie of Goal.com:
Once in the tunnel, Barça’s No.9, Suarez, Luis, while the Espanyol players were coming up the stairs, waited for them and shouted at them on various occasions. He [Suarez] said: ‘I’m waiting for you, come here! You’re a waste of space.’
"It provoked a confrontation between players of both clubs and the present security guards had to get involved, as did coaches of both teams.”
Barcelona won the match, 4-1.
Despite his immense talent, Suarez's career has also been defined by several incidents that have resulted in lengthy suspensions.
He was banned for four months from all competitions on the club and international level in 2014 after biting Italian defender Giorgio Chiellini during a World Cup match between Uruguay and Italy. That followed a 10-game ban for biting Chelsea's Branislav Ivanovic during a Premier League match in 2013 and a seven-game ban for biting PSV Eindhoven's Otman Bakkal in 2010 during his Ajax days.
Suarez has largely stayed out of trouble since debuting for Barcelona in October of 2014, however, and has been phenomenal on the pitch, scoring 16 goals and adding 14 assists in 27 La Liga appearances last season while already bagging 15 goals and three assists in 16 league fixtures this season.
This latest incident could cost Suarez some game time, though, as AS English noted:
AS English @English_AS
Our suspensions expert says most likely 1 to 2 game ban for Suárez for provocative comments - & served only in the Copa.2016-1-7 00:01:05
That would be a blow to Barcelona's deadly attack, at least temporarily, though the team would still have Neymar and Lionel Messi, among others, to rely on if Suarez is forced to miss any time because of his alleged actions on Wednesday.