When returning to form in December, Nadal had tested positive for COVID-19, keeping him away from the practice court.
The Serbian winner expressed his hope that attention will now shift back to tennis and the Australian Open Grand Slam, which begins Monday.
A federal court on Sunday upheld the Australian immigration minister cancelling the visa for Novak Djokovic, meaning he will be deported.
The Serb's chances of winning a record-breaking tenth title in Melbourne are in jeopardy after his visa was cancelled twice.
Andy Murray lost to Aslan Karatsev in the final of the Sydney Tennis Classic 6-3, 6-2 as his two-year wait for an ATP title goes on.
Australian immigration minister Alex Hawke asserted that the government will stand by its measures to curb the pandemic.
The World No.1 has been drawn against his Serbian compatriot Miomir Kecmanović for the first round.
Nadal made a huge statement ahead of the season’s first Grand Slam – Australian Open – by lifting the Melbourne Summer Set trophy.
Djokovic's visa was revoked by the Australian government shortly after he arrived in Melbourne on Wednesday to compete in the Australian Open.
The Spaniard marked his return to the ATP Tour in some style, beating American qualifier Maxime Cressy 7-6, 6-3 in the final.