FC Twente could see the return of top scorer Luuk de Jong back for this week's crunch Eredivisie clash with AZ.
Dutch international De Jong, the scorer of 20 league goals for
"The ankle feels good, I have no more trouble," De Jong told www.tctubantia.nl.
His availability would be welcomed by McClaren with captain
Twente goes into the game in third, two points behind AZ, who is a point adrift of leaders Ajax.
Fourth-placed PSV Eindhoven is just four points off top spot and still in contention.
It goes to RKC Waalwijk buoyed by its 3-0 defeat of Heracles in the final of the KNVB Beker.
"For many guys, including myself, this is the first prize in their careers," he said.
"This win against Heracles gives us a happy feeling."
"But on Wednesday we go to RKC and that is where the focus should now lie."
"We need to win all our matches in the league and hope our competitors drop points."
Feyenoord will look to maintain its Europa League challenge when it visits Roda JC while Wednesday's other game sees Heracles at NAC Breda as it bids to bounce back from weekend disappointment.
The midweek action starts with Excelsior hosting NEC Nijmegen.
Excelsior go into the game second from bottom and with time running out on its bid to avoid the relegation play-offs.
It is 11 points from safety but just two above rock-bottom De Graafschap, who is staring at automatic relegation.
De Graafschap do not play until Thursday when it meets FC Utrecht in Doetinchem.
ADO Den Haag hosts FC Groningen and Vitesse Arnhem visits struggling VVV-Venlo.
Ajax coach Frank de Boer has agreed a new four-year contract with the Eredivisie champion.