PSV slipped to a 2-1 loss on Wednesday to allow Feyenoord to climb to the top of the Eredivisie table following their 2-0 win over city rivals Sparta Rotterdam.
Belgian midfielder Simons felt PSV´s defeat was fair and is aware they must improve if they are to retain the league title, telling fcupdate.nl: "We have suffered too many blows in the past few months. It is hard to take but the loss was the right result - for the first 20 minutes Groningen won everything."
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