The central defender, famed for his hard-hitting style of play, was sent off in the closing stages of the game after collecting a second yellow card.
"I'm not happy with what happened to Sergio".
"I don't like seeing my players get sent-off, but we can't change it now".
Even the stoppage time sending off of Sergio Ramos couldn't ruin what was an ominously clinical performance by the pre-season title favourites.
"It isn't an easy place to come and they had chances to score".
Real were without Cristiano Ronaldo, and will be for the next three games after his suspension in the Spanish Super Cup.
It was Depor who started the match on the front foot and forward Florin Andone had two good opportunities to give them the lead, but he was foiled on both occasions by Real stopper Keylor Navas.
Victory in midweek sealed a fourth trophy for Zidane's men in as many months after lifting La Liga, the Champions League and UEFA Super Cup.
It was Real Madrid, who enjoyed 74 per cent of the possession in the opening half of football, that entered the interval with a two-goal advantage, however, courtesy of efforts from Bale and Casemiro in the space of seven minutes.
- Gareth Bale has ended a run of 10 games in all competitions without scoring for Real Madrid, his longest drought for the club.
In Barca's first home match since a pair of terrorist attacks killed 14 people and wounded around 120 in Barcelona's bustling Las Ramblas boulevard and the nearby seaside resort of Cambrils, Barcelona players wore black armbands and shirts with "Barcelona" replacing individual names on the back.