Newly-signed Middlesborough defender Michael Reiziger will be out for up to eight weeks with an injured shoulder.

Reiziger, 31, undergo an operation to stabilise the shoulder initially injured during Boro’s pre-season friendly against Hansa Rostock of Germany.

“Michael will be out for at least six weeks and that’s a blow for us,” manager Steve McClaren told the club’s official website, www.mfc.co.uk.