The Boro full-back was recalled by manager Gareth Southgate from his loan spell at Hiilsborough on 23rd October because of injury to Justin Hoyte.
However, the 22-year-old full back did not make any appearance's for Boro because he had been sent-off in the Owls game against Barnsley and was serving a three game ban.
With Hoyte now fit again, McMahon will return to Hillsborough to complete the final 28 days of his original loan deal which expires at the end of November.