Barcelona striker Zlatan Ibrahimovic believes his former coach Jose Mourinho will find it tough at Real Madrid this season.
Ibrahimovic, who joined Barca last summer, spent a year under Mourinho at Inter Milan before making the switch to Camp Nou.
Portuguese boss Mourinho, who won the treble of Serie A, Coppa Italia and UEFA Champions League titles at Giuseppe Meazza last term, also made the move to Spain when he joined Barca's fierce rivals Real in May.
And Ibrahimovic feels he will face a difficult task on his debut season with the La Liga club, who finished second in the standings behind Barca last term.
Challenge"It's a big challenge for Mourinho," said Ibrahimovic.
"He is the best or one of the best coaches in the world. I don't believe in Madrid, but I believe in Mourinho."
Ibrahimovic himself has reportedly attracted Real's interest this summer, but the striker is adamant he is happy at Barca.
"I'm at the best club in the world," he said.
"Last year in Italy I had won just about everything. I needed big challenges and that's why I took the step (to join Barcelona)."
Ibrahimovic won the Primera Division title on his first season with the Catalan giants, but faces a fight for a spot in the first team this term following the signing of Spain striker David Villa.
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