Prince William, Prince Philip
Prince William reportedly sought his grandfather's advice before his split with Prince Harry. Pictured: (L-R) Prince William, Duke of Cambridge, Prince Philip, Duke of Edinburgh, Catherine, Duchess of Cambridge, Meghan Markle and Prince Harry attend Christmas Day Church service at Church of St Mary Magdalene on December 25, 2017 in King's Lynn, England. Getty Images/Chris Jackson

Prince William was reportedly concerned over Prince Harry's future in Buckingham Palace and sought Prince Philip's advice before the two brothers split their royal households.

Journalist Rebecca English revealed in a Daily Mail report that Prince William called his grandfather, 97, at Sandringham before his and Prince Harry's split was announced. Several weeks ago, Kate Middleton's husband reportedly had concerns over the split and sought Prince Philip's "wise counsel."

While both he and his younger brother have long been aware that they will eventually need to separate, Prince William was reportedly worried that Prince Harry wouldn't be well-supported by Buckingham Palace. He apparently discussed his brother's plans with Prince Philip, who undoubtedly had more experience with the ins and outs of the palace.

English added that it "is not known what was discussed between the pair but clearly the future king’s mind was put at rest."

Kensington Palace and Buckingham Palace announced on Thursday that Prince Harry and Markle had officially split royal households with the Duke and Duchess of Cambridge.

“This long-planned move will ensure that permanent support arrangements for The Duke and Duchess’s work are in place as they start their family and move to their official residence at Frogmore Cottage,” a statement from the palace read.

Queen Elizabeth II and Prince Charles apparently approved the creation of a new household for the Duke and Duchess of Sussex in the spring.

Middleton and Prince William's office will remain in Kensington Palace, where they live with their three kids, Prince George, Princess Charlotte and Prince Louis.

Prince Harry currently has his own private office, which has been supporting both his work and Markle's since they announced their engagement in 2017.

Joining Prince Harry and Markle's staff upon their move is former Hillary Clinton adviser Sara Latham, who will lead the royal couple's communications team. Latham has dual citizenship in the UK and U.S., according to her Linked In page.

The split has fueled rumors that there is tension between Prince William, Middleton, Prince Harry and Markle. However, royal aides confirmed the move had always been inevitable because of Prince William's future roles as Prince of Wales and as a king.

"It’s about placing the two dukes on a permanent footing that ensures changes aren’t needed again [when Charles accedes to the throne and William becomes Prince of Wales]," a source said of the brothers' split.