MILAN – Venus Williams plans to make her comeback in an exhibition match against her sister, Serena in Colombia on Wednesday after being forced to pull out of the U.S. Open because of an immune system disease.

Venus said that she has changed her diet to fill it with vegetables after being diagnosed with Sjogren’s syndrome, which can cause fatigue and joint pain.

The Williams sisters will play Italian pair, Francesca Schiavone and Flavia Pennetta in another exhibition match in Milan on Dec. 3.