United Kingdom, Dec. 9 -- Justin Timberlake is "doing OK" amid his Lyme disease battle.

The 44-year-old singer revealed this summer he had been diagnosed with "relentlessly debilitating" Lyme disease - a bacterial infection spread to humans by ticks, which can cause symptoms ranging from nerve pain and fatigue to cognitive difficulties and chronic illness - following his two-year Forget Tomorrow World Tour.

The Mirrors hitmaker's wife Jessica Biel, 43, is said to be "supporting" him amid the star "prioritising his health" following the "gruelling" two-year run of gigs.

A source tells PEOPLE: "Justin seems to be doing okay. He's prioritizing his health after the gruelling tour and Lyme disease diagnosis.

"Jess is supportive. She wants ...