A visit by Pope Francis to Lebanon, scheduled for June 12-13, may be postponed because of the Pontiff’s persistent knee problems, the Reuters news service reports.

The Pope has been confined to a wheelchair recently, as painful knee problems have severely limited his ability to walk. He has disclosed plans for injections which may relieve the symptoms.

The Pope’s travel plan for June has not been officially announced by the Vatican, but has been discussed by Lebanese officials.

If the Pontiff’s health problems continue, the Vatican may also be forced to reconsider plans for a papal visit to Africa in July, and to Canada later this year.