Lopetegui was announced as Zinedine Zidane's successor in a move that surprised many just days before the World Cup in Russian Federation is due to start.
Meanwhile, Spanish giants Real Madrid have revealed that the former Spain national team coach will be unveiled later in the evening as the new club's head coach.
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The Spanish football federation said it dismissed Lopetegui two days before Spain's opening game against Portugal, because the negotiation occurred "without any information" being shared with the organisation.
"The team will do everything to get the best results, we can not talk about hypothesis, but the RFEF can not find out five minutes before it becomes public. There's a way to act that needs to be fulfilled".
"I very much admire Julen and respect him greatly". Lopetegui has done impeccable work.
The Spanish giants have been on the hunt for a new manager ever since Zidane surprisingly stepped down last month, just days after winning his third consecutive Champions League trophy. As Spain, one of the favourites to win the competition, takes on Portugal in a Group B match on Friday, the timing of the decision to fire its coach is shocking.
Ex-Bolton Wanderers man Hierro has been thrust straight into the managerial position to take Spain into the competition, just hours after Lopetegui had been sacked, making the move from his previous position as the Sporting Director of Spain.
Rubiales travelled from Moscow back to the Spanish training base in Krasnodar late on Tuesday, confirming Lopetegui's departure at a press conference the next day. "It may look like a weakness now, but with time this will make us stronger".
Lopetegui, 51, was appointed Spain's coach in July 2016 and never tasted defeat in the job, leading the team through 20 unbeaten games ahead of the World Cup. "When we know we will tell you".