Wales assistant Raymond Verheijen says he will "evaluate" his future as his Football Association of Wales (FAW) deal expires at the end of 2011.
He will be in in a fixtures meeting with Wales manager Gary Speed on Wednesday to discuss Wales' 2014 World Cup qualifying Group., but on the eve of that meeting, he has questioned the FAW's direction.
"Will the FAW be able to grow with [the] team or will they ultimately slow process down so the team will fail?"
Verheijen's comments appeared on his Twitter account. on Tuesday, where he said: "My consultancy contract with Wales expires at the end of the year."
After questioning whether the FAW would "grow with [the] team," he added "My mentor Guus Hiddink has taught me to constantly check whether people do all they can for the team or for themselves and their ego."
Verheijen worked with Hiddink during the former Chelsea manager's time as coach of Netherlands, Russia and South Korea.
Wales manager Gary Speed made Verheijen one of his first appointments when the former Wales captain was appointed as John Toshack's full-time successor in December 2010.
But he caused controversy on Twitter ahead of Wales' Euro qualifying defeat to England in March.
Verheijen's coaching methods, have helped see Wales transformed from a side which lost six internationals in succession at the end of 2010 and start of 2011 to a team which has won three games in a row for the first time in nine years.
Speed was "disappointed" when he was without fitness coach Damien Roden, a key member of his backroom staff, for Wales' final Euro 2012 double-header with Switzerland and Bulgaria because of a contract dispute with the Welsh FA, and now may be losing another member of the coaching team.
"[I] will use Xmas period to evaluate and make new plans for the future," Verheijen added on Tuesday.