Paco Alcacer has claimed he was treated badly by many people at Barcelona ahead of his reunion with the La Liga club .
The Borussia Dortmund forward will come up against his former club when Lucien Favre’s side start their Champions League campaign on Tuesday.
Alcacer, 26, failed to make an impact in his two years at the Camp Nou after struggling to cement a regular place in a strong front line including Luis Suarez and Lionel Messi.
He joined Dortmund on loan at the start of last season before making the move permanent in February.
After a successful opening 12 months in Germany, which saw him score 18 Bundesliga goals, the Spaniard has already found the net seven times in all competitions this season.
And when asked if he would celebrate scoring against his former club, Alacacer told SER Catalunya (via Goal ): “I’ll decide in the moment.
“I have respect for many people there. Many people behaved very well with me but many people behaved very badly. My team-mates and the fans treated me well.
“As in any job, if people trust you, you give your best, and if they don’t trust you, you don’t give it.
“It’s very important for me to see those signs of trust and in the end many people did not show it.”
Dortmund are second in the Bundesliga after taking nine points from their first four league games and enter Tuesday’s meeting on the back of an emphatic 4-0 win over Bayer Leverkusen.
Alcacer opened the scoring in that game, which also saw a Raphael Guerreiro goal and a second-half brace from Marco Reus.
Meanwhile, despite Saturday’s 5-2 win over Valencia, Barcelona are fifth in La Liga after winning just two of their first four games with the injured Messi.
With the Barca captain also expected to miss the trip to Germany, Alcacer admitted he would not be disappointed to see the Argentina striker delay his return until the weekend.
“It’s clear that a player of that level is important for the team and for the club,” he added when asked about his former team-mate .
“You will always ask for his opinion and listen to him.
“Hopefully he will play next weekend, against Granada, and not against us!”