A press conference arranged for this afternoon is expected to confirm that legal difficulties which had delayed a contract extension in the summer have now been resolved.
The news has implications for the England management set-up because McClaren is also a key part of the coaching team under Sven Goran Eriksson. He has been tipped as one of the favourites to succeed Eriksson.
McClaren, 45, formerly No 2 at Manchester United, joined Middlesbrough in June 2001.
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