On Tuesday's edition of the daytime show, Dr Phillipa joined Dr Zoe to discuss the lockdown news.
Host Phillip Schofield asked: "How long do you think before we start seeing some sort of improvement?"
Dr Phillipa replied: "I think we are at least looking at two or three weeks. The act of improvement at that point is not a decrease, it's that our numbers stay the same.
My colleagues and I would be surprised if rules got relaxed.
"That is in our really good case scenario.
"The Prime Minister said he was going to review in three weeks time but my colleagues and I would be extraordinary surprised if rules got relaxed in three weeks.
"It’s possible that they will get stricter before they get relaxed."
It comes hours after Boris addressed the nation and urged millions of Brits to stay home.
He said in the speech: "We're seeing the devastating impact of this invisible killer. You must stay at home."
Explaining the four reasons we can only leave home for, he continued: "Shopping, one hour of exercise a day, any medical need or to provide care to elderly and, travel to and from work where absolutely necessary.
"These are the only reasons you should be leaving home."
The new measures will see the closure of all shops aside from supermarkets, food stores and pharmacies. Playgrounds, churches and libraries will also shut down.
All ceremonies – including weddings and baptisms – have been halted. However, funerals will go ahead.
Boris also issued a warning to Brits about how the NHS will struggle to cope if people continue to ignore the guidelines.
He said: "It’s vital to slow the spread of the disease to protect the NHS's ability to cope and save more lives."
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