"Got a spider bite on my foot. Christmas different every year," Kyrgios posted on Instagram.

The former world No.13 also added a picture of him with an intravenous drip with the caption: "This spider bite outta control."

Organisers were confident the hospital visit would not derail Kyrgios' preparations, saying his Brisbane International plans were still in place.

Kyrgios is the eighth seed at the Brisbane International which starts on Sunday.

He is hoping to bounce back in 2019 after his ranking slipped from world No.21 to 35.

Kyrgios began the year in style by claiming the Brisbane crown in January - his fourth career title - when he defeated American Ryan Harrison in the final. However, it was his only tournament triumph in 2018.

He entered 16 events but after his Brisbane win only advanced past the round of 16 four times - none at a grand slam.

His frustrating season ended abruptly in October due to a recurring elbow injury, forcing his withdrawal from Moscow's Kremlin Cup.

AAP