*Look Magazine is reporting that Jay-Z has concerns over his mentee Rihanna and what is being described as her “deteriorating health.”

Last month, the singer tweeted she had a bout of bronchitis, yet still made scheduled appearances at the Grammys and NBA All-Star Game in the midst of her illness.

Jay-Z, who signed Rihanna to his label, is now reportedly worried that the 23-year-old is being overworked and that her current schedule is causing her health to decline.

“Rihanna’s professional, works hard and stays away from drugs and alcohol, but Jay wants her to be careful,” a source told the publication.

“[Jay-Z] told her to take a holiday for a week –- she’s been working flat out and needs to get over the bronchitis, which he’s sure she’s developed as a result of stress,” the source continued. “He told her she’ll be all right, but to keep her head down.”

The magazine also reports that Jay-Z is concerned the singer could resume contact with ex-boyfriend Chris Brown, now that a judge recently reduced a restraining order against him. Brown’s order is now a level one, granting him the right to have contact with Rihanna so long as he does not “harass, annoy or molest her.”