Boro suffer Watson injury blow
Watson was substituted towards the end of the first half after taking a knock.
It initially wasn't thought to be too serious, however the news of the break has now been confirmed.
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Hide AdA statement on the club's website said: "It's a blow for both Watson and Boro, as the recent signing has been a stand-out performer since coming in from Farsley Celtic and this obviously means he misses the clash with his former club on Saturday.
"Everyone at the club wishes him a speedy recovery and hope to see him back in action in a Boro shirt again soon."