Crewe have sacked manager Gudjon Thordarson.
In a statement chairman John Bowler said his contract was being ended after ten months in charge.
"The board of directors met last night and decided that it would be in the best interest of the club that we parted company with Gudjon as manager," said Bowler.
"It doesn't affect any of the other staff at the club and for an interim period Dario is taking over as manager."
Crewe have lost their last four games, including a 5-3 reverse to Accrington, and they have won just four of their last 22 games.