The 19-year-old had been linked with a number of Championship clubs, but has now signed a deal with Boro.
The youngster has joined Boro on a season-long loan.
McEachran made just five appearances while on loan at Swansea last season.
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The start of the 2017-18 Premier League season is just around the corner and is shaping up to be one of the most competitive yet.
As always it is the so called “big clubs” that have splashed the most cash in the transfer window so far this summer. Manchester United or City? Arsenal or Tottenham? Who are the winners and losers of the transfer window so far?