(CNN) Former Trump campaign chairman Paul Manafort appeared in a wheelchair in a Virginia courtroom Friday afternoon, where he learned he will be sentenced next February even while his cooperation with special counsel Robert Mueller's investigation continues.

His lawyer Kevin Downing said Manafort's health has "significant issues," related to the "terms of his confinement." He asked Judge T.S. Ellis to move on to the sentencing phase quickly, so he could be moved out of confinement at the Alexandria detention center and into a Bureau of Prisons facility, if he is sentenced to prison.

Manafort, who was convicted on eight counts in August, appeared in court in a wheelchair, with his right foot raised off the ground and in a sock. He is experiencing a serious medical condition -- inflammation that's related to his diet, a person familiar with Manafort's condition said.

In addition to setting the sentencing date for February 8, Ellis will dismiss 10 charges on which the jury could not reach a verdict during the August trial.

The prosecutors may be able to bring those charges back if his cooperation is not successful, and they will also have the option to ask the court to reduce his sentence later if Manafort is especially helpful to their ongoing investigation.

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