O'Shea, a cult hero at United, has been named as interim manager of the Republic of Ireland.
The 42-year-old did serve on Stephen Kenny's coaching staff, before the latter lost his job in November.
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O'Shea said: I'm delighted to return to the senior men's coaching staff as interim head coach for the two international friendlies against Belgium and Switzerland.
It will be an incredible honor to lead the side into the March international window.
As everyone will know, I've always had immense pride representing my country, whether that be during my playing career or very recently, as part of the coaching staff for the men's senior team and the Under-21s."