Chris Coleman has resigned as coach of Real Sociedad, less than a week after saying he would stay with the Spanish second division club.
Coleman took over at Real Sociedad only last summer
Coleman said he and assistant Steve Keane were unable to work alongside newly elected president Inaki Badiola.
"It is with much sadness that we leave a great club," said Coleman.
"Things have changed with the arrival of Badiola as there were two distinct ways of looking at the club and it's operations."
Badiola had hoped former Wales international Coleman would stay in charge of the club, and the pair met to discuss the future last week.
Having asked for a few days to consider his position, Coleman last Thursday announced he would be staying at Sociedad for "as long as the club need me" after receiving the backing of both his players and Badiola.
But the 37-year-old appears to have had a change of heart and announced to a press conference that he was stepping down as coach.
Coleman had originally offered to step down following the resignation of president Maria de la Pena in November, but he was persuaded to stay by the Sociedad board.
De la Pena played an influential role in bringing the former Fulham boss to San Sebastian last July on a three-year contract after the club lost their first division status for the first time in 40 years.
After a slow start to the season which saw Coleman's side win only four of their opening 10 league and cup games, Sociedad have now lost just one of their last 11 matches.
They beat local rivals Alaves 1-0 last weekend to move up to fifth in the Segunda Division standings, one point behind Sporting Gijon who occupy the third and final promotion place.