Prime Minister David Cameron said he and Boris Johnson have discussed a possible return to Parliament for the London Mayor, but stressed a decision has yet to be taken.
Asked how likely a return was, Mr Cameron told BBC Radio 4's Today programme, "That's up to Boris."
He continued: "I've had this conversation with Boris and my message to him is 'You're a brilliant Mayor of London, you've done a great job, you've got a lot more to give to public life, and it would be great to have you back in the House of Commons at some stage, contributing to public life'.
"But that's up to him, but I'll certainly be giving him a warm welcome."
Poet Laureate Carol Ann Duffy has joined leading academics and children's authors in condemning Education Secretary Michael Gove's policies as being harmful to children.
A total of 198 people, including Children's Laureate Malorie Blackman, said they are "gravely concerned" by new policies in state education and have called for the reforms, affecting the national curriculum and exams, to be halted.
Their letter, published in The Times (£), comes as Mr Gove prepares to address the Conservative Party conference in Manchester.
"These damaging developments must stop," they wrote. "If they go ahead there will be devastating consequences for children's mental health, for future opportunities and, most importantly, for the quality of childhood itself."
The Prime Minister does not want to "see deals or pacts" ahead of the 2015 General Election and instead hopes a robust Conservative Party will be re-elected to Government.
Speaking to Daybreak, David Cameron wanted to see "a strong Conservative Government with a clear mandate":
The Conservative Party conference has been dogged by rumours of an alliance with Ukip in an attempt to boost their chances of winning seats.
While Mr Cameron did not openly support an agreement with Nigel Farage's party, he did encourage Ukip voters to back Conservative candidates in their area "because that is the only way you can be guaranteed an in-out referendum on Europe".
David Cameron said what matters "is not what politicians are wearing, but the ideas in the head and the actions that they are taking."
Asked whether it was "insensitive" that Theresa May had worn sparkly shoes and a Vivienne Westwood suit said to be worth £1,200 for her party conference speech, Mr Cameron said she gave "a great speech yesterday."
The Prime Minister continued: "This is a Home Secretary who has cut immigration, who has cut crime, who got Abu Qatada out of our country and back to Jordan.
"I think that's what matters most of all, not whether someone chooses to spend their money on shoes or a suit or what have you."
Prime Minister David Cameron said he does not want to see "deals or pacts" at the next General Election.
When asked on Daybreak whether he would consider a deal with Ukip, Mr Cameron said: "I want to offer people at the next election a strong Conservative Government with a clear mandate to keep on growing our economy, paying down our deficit, delivering for hard-working people.
"Of course, if local Ukip supporters or candidates want to support the local Conservative candidate because that's the only way you can be guaranteed an in-out referendum in Europe ... then of course I'd welcome that."