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I don't think he had any say in transfers nor had seen them playing. If we had a proper structure who knew what he wanted, he would have been successful.
His recommendations were Bastian,Blind, Romero,Depay and Rojo.
Bastian was old but he knew what he wanted. A deep lying playmaker.
Blind and Rojo - he wanted a left footed CB who can come forward and pass.
Romero - a keeper who is composed on the build-up.
He definitely had a say in the matter, he turned down Kroos and both Blind and Depay came due to the Dutch NT link. During his first season most signings were lined up already by the club due to him being at the WC, but he did have the veto, and he agreed on Shaw, Herrera and AdM, Falcao was an opportunistic last minute loan. In the 2nd season Depay (who were linked for the whole year and widely reported that remained at PSV at his advice), Schweistenger and Schneiderlin were all his choice, as were Martial. It was also his choice to sell RvP, not bring anyone else in after Falcao left and relied on Rooney as his main striker.
His hit rate wasnt that bad and despite the overreaction after his departure, his signings overall did not cost the club a lot, as evidenced by Mourinho being free to go on a spending spree the next couple of seasons. We took some losses here and there but recouped most of the money for AdM, Blind, Depay, Schneiderlin. It's mostly the 2nd season signings not working out, Shaw being chopped in half 9 games into the season and Rooney's uselessness that saw the team tumbling down during the winter and new year.