The left-handed batsman, hit by a Sean Abott bouncer, is still in a critical condition and is being treated at Vincent hospital.
The match between the New South Wales Blues and West End Redbacks at the SCG was abandoned yesterday after Hughes was rushed to hospital having been struck on the head by a Sean Abott bouncer.
But after consultation with the players and the Australian Cricketers' Association (ACA) the other two matches - in Melbourne and Brisbane - were also called off.
"In conjunction with Cricket Australia ... It was decided not to play and we think that was the right decision. The players now are obviously going home where it's relevant to be looked after in their states and with the ACA."
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Nicholson also said that there have been no discussions about the status of the upcoming fixtures on the Australian calendar, especially India's tour match against a Cricket Australia XI, which begins on Friday in Adelaide.
"Obviously, every player and how they react is different," Nicholson said. "In regards to those fixtures later on, that's not something we've had any specific conversations on yet."
"We've spoken to players and the ACA, and given how players across the country are feeling right now, it's just not the day to be playing cricket and we understand that," said Howard.
"We are continuing to offer all players and match officials counselling and support at this difficult time.
"Phillip Hughes continues to receive the best possible medical care. The thoughts of his teammates and the wider cricket community are with Phillip and his family and friends at this difficult time."