With the transfer window firmly closed until January, Premier League clubs up and down the land have a few months to reflect on their summer business. But which sides had a window to remember? Who surprised their rivals with some wise acquisitions? And which players who chose to go elsewhere would've been the biggest asset to England's top-flight? We asked our three wise men - Jamie Carragher, Martin Keown and Jamie Redknapp - those questions and more. Here's what they had to say. VIDEO Scroll down to watch Costa and Welbeck in action this week for their countries Big money buy: Manchester United splashed a British record transfer fee on midfielder Angel di Maria
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The summer transfer window closed on Monday night
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Chelsea strengthened their squad and sold their unwanted players
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Diego Costa has helped fire Jose Mourinho's side to the top of the table
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Danny Welbeck has a point to prove after leaving Manchester United
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The 23-year-old joined Arsenal in a £16million deadline day deal
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Hull have made some inspired signings, including Hatem Ben Arfa on loan
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Sandro will give QPR a strong presence in central midfield
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Xabi Alonso and Toni Kroos would've been great additions to the Premier League but both moved elsewhere
And I won’t apologise for saying it but Sandro is an excellent signing — he’s a monster, exactly what @placeholder needed.