This Spanish article at marca.com indicates that Rafa has pulled out of Dubai. It also looks like Verdasco is out of Dubai and the first round of Davis Cup.
This news is now on Rafa’s official site.
“I am very disappointed not to be able to compete in Dubai but the doctor has advised me to stay home and rest after the pain on my knee in Rotterdam last week. Nothing to be worried about but it needs some rest. I ask my fans and the tournament organizers to understand and I am sorry for this. Dubai is one of my favorite tournaments and I have always played there. The field is always great and more important the crowds are always supportive. I expect to be back in competition the following week for the Davis Cup tie in Benidorm against Serbia and then traveling to Indian Wells and Miami after”.