Superstar Neymar has been ruled out after fracturing his back in the quarter-final win over Colombia, and Mourinho says a shift in tactics will help Luiz Felipe Scolari replace his most influential player.
"It depends always what the coach has in his mind," Mourinho said in his capacity as Yahoo's Global Football Ambassador. "It also depends on the strategy the coach has for the game - what is the game plan?
"I think Oscar is playing now in a position where Oscar is not Oscar, and the position where Oscar is Oscar is the position where Neymar is playing now.
"Oscar was pushed to the right side for Neymar to play in that position with freedom behind the striker and that is the position where Oscar likes more to play.
"At the same time, Willian is a better player coming from the sides. In my opinion I would go with Oscar as a No. 10 and Willian coming from the side."
Mourinho also analysed both teams contesting Tuesday's semi-final in Belo Horizonte and explained why Germany have to cope with a "real team" in Brazil, and why they face such a tricky task.
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