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Barcelona are in dire need of a left back to compete with Jordi Alba for his spot and also give him a bit of rest during the season. Except they are lining up a bid for an experienced left back, I don't see any need for such a deal.
I wouldn't say no to Mandzukic tho, he has experience and the team needs a back up striker.
I agree with you on this, I doubt Barcelona will let Miranda leave, as there will be no cover for Jordi Alba.
Mandzukic will only end as another Kevin Prince Boateng, I'd rather have Griezmamn as back up for Suarez that's if the flanks are occupied already, but with Dembèlè proving to be unreliable, numerous back up plans wouldn't be a terrible idea.