The defending champions toiled against their lowly opponents and looked set to drop two vital points when Excelsior´s Geert Den Ouden cancelled out Balazs Dzsudzsak´s opener with nine minutes to go.
But Koevermans, who had come on as a 61st-minute substitute for Jason Culina, grabbed the winner with time almost up to move PSV six points clear of the chasing pack.
Copyright (c) PA Sport 2008, All Rights Reserved.
Do YOU want to write for GiveMeSport? Get started today by signing-up and submitting an article HERE: http://gms.to/writeforgms