Arca was injured on his Boro debut
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Middlesbrough have suffered another early season blow with news that new signing Julio Arca is out for three weeks with a broken foot.
The 25-year-old Argentine fractured a bone in his foot in the defeat at Reading, where Boro took a two-goal lead before losing 3-2.
Arca is Boro boss Gareth Southgate's only summer signing to date, captured for £1.75m from Sunderland.
Boro face champions Chelsea at the Riverside stadium on Wednesday.
Arca was injured in a penalty-box scramble at the end of the first half at the Madejski stadium.
He was substituted at half time, with Stuart Parnaby switching to left-back and Andrew Davies coming on at right-back.