BERLIN, MARCH 09 (Reuters) -- Egyptian President Hosni Mubarak's condition is improving after successful gallbladder surgery in Germany on Saturday, a hospital spokesman said on Tuesday.

The spokesman added it was unclear how long the 81-year-old Mubarak would remain in the hospital in the western city of Heidelberg, but the medical team would give an update on his condition in the next two days.

Egyptian Health Minister Hatem el-Gabali, who is with Mubarak, said late on Monday that the president was surrounded by his family.

"President Mubarak is ... under the supervision of the medical team in the intensive care unit where the president is moving inside the room and is having semi-solid food," he said in a statement.

Mubarak, in office for almost three decades, handed power temporarily to his prime minister before the operation last week, Egyptian media said. He had shown no signs of frailty at a news conference with German Chancellor Angela Merkel on Thursday.