Ronald Koeman was delighted with the character shown in Barcelona's victory over Real Betis but recognises his team must continue to prove their winning mentality.
Barca made it six away wins on the bounce in LaLiga as Trincao's late strike secured a 3-2 victory over Betis on Sunday.
Borja Iglesias' first-half tap-in put Betis ahead, but Lionel Messi scored 136 seconds after his introduction from the bench – his fastest goal as a Barca substitute – to restore parity before Victor Ruiz turned into his own net.
Ruiz atoned with a fine header to make it 2-2, yet Trincao, another visiting sub, had the final say to lift Barca back into second place in LaLiga.
"We must highlight the mentality of the team; in a tough game we have won for quality and for having an important character," Koeman told reporters.
"For me, the first half was not very good. We needed more to open up Betis when we had the ball. When we lost balls, we reacted late. I have not seen a team with much spark in the first half.
"The Copa del Rey [which Barca played in on Wednesday] is a trophy where we are in the semi-finals. It is the shortest way to win something.
"It is important, but we are Barca. You have to show mentality in any game in any competition."
Trincao's strike, which took a slight deflection on its way into the top corner, was the 21-year-old's first LaLiga goal.
However, the winger insisted the most important factor for him was helping Barca to secure the points.
"I didn't need to score, just do my job. You have to help. I'm very happy for the team and the victory," said Trincao, who became the fifth Portuguese player to score for Barca since the turn of the century, after Deco (13 goals), Andre Gomes (three), Nelson Semedo (two) and Ricardo Quaresma (one).
"We changed our attitude in the second half. It was the most important thing for the victory. We want to win everything and we are going to do everything possible to win.
"The spirit of my team-mates helps me a lot. They have all congratulated me for the goal."
Barca have now won their past nine away games in all competitions, the third-best streak ever for the club after 13 in 2008-09 and 10 in the 2014-15 campaign.
They sit seven points adrift of leaders Atletico Madrid, although the gap will be back at 10 points should Diego Simeone's team overcome Celta Vigo on Monday.