The frontline politician and his wife, Ifunanya, were seen boarding a flight on Lufthansa airline from Abuja to Wiesbaden, Germany, on Monday.
Kalu, who had been suffering from an undisclosed and life-threatening ailment, upon arrival in Germany on Tuesday, was rushed in an ambulance to Helios Klinik, Wiesbaden.
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The APC chieftain, who is asthmatic, has been in and out of the said hospital in the past few months, but his wife, Ifunanya, who was with her husband in the German hospital, said the former governor was admitted into the operating theatre for a major operation on Wednesday.
In a telephone conversation on Friday, Mrs Kalu, whose voice was quavering, lamented her husband’s health status saying: “Although the surgery was successful, my husband will still have to be monitored closely by a medical team for at least, four months in order to prevent complications.
“His condition is improving gradually. He will be fine, if he is able to keep to his doctor’s advice. We appreciate the prayers and kind words from friends, associates, well-wishers and Nigerians in general.”