The injury picked up at the Davis Cup had already forced Andy Murray to miss the Australian Open which starts on Monday.
Karolina Pliskova has hired Venezuelan coach Daniel Vallverdu with former Ukraine Fed Cup player Olga Savchuk -- a long-time friend -- also joining her team.
Kei Nishikori, who has slipped to 13, said he was disappointed not to be able to begin his season as hoped for in January.
Andy Murray had hoped to make his return to Grand Slam action in Melbourne following a hip operation in January.
Andy Murray suffered a bruise to his pelvic bone during Britain's Davis Cup campaign in Madrid last month, the report said.
Rafael Nadal won his 26th consecutive Davis Cup singles match later on Wednesday as Spain booked their place in the quarter-finals with a 3-0 victory over defending champions Croatia.
Davis Cup Final: Andy Murray scripted a miracle comeback as he came from 1-4 down in the decider to beat Netherland's Tallon Griekspoor.
Andy Murray believes negativity around the reformed Davis Cup has been unfair and is urging people to give the new competition a chance to succeed.
Davis Cup: Great Britain captain Leon Smith named four of his five-man team, with two-time Wimbledon champion Andy Murray alongside his brother Jamie, Dan Evans and Neal Skupski.
Andy Murray, rebuilding his game after career-saving hip surgery earlier this year, fought back from a set and 3-1 down against Stan Wawrinka to claim his 46th career title.
Andy Murray, steadily rebuilding his career after major hip surgery earlier this year, defeated qualifier Marius Copil 6-3, 6-7 (7/9), 6-4.
Andy Murray, a three-time Grand Slam champion, is attempting to work his way back to form almost 10 months after career-saving hip surgery.
Andy Murray has consistently said his hip is pain-free but that he does not have the fitness to play several matches a week and needs to be quicker across the court.
Andy Murray said he heard someone make a noise as he was about to serve and looked up in the direction of where the noise was coming from.
Andy Murray has been slowly working his way back to fitness and is now ranked 289th, up from 503rd just a week ago.
Andy Murray climbed over 200 places in the new ATP rankings, while Novak Djokovic extended his lead over Rafael Nadal at the top.
China Open: Naomi Osaka said that she felt she had been "counted out" after hitting poor form following her Australian Open triumph in January.