Raila Odinga on Thursday met Archbishop Justin Welby of Canterbury and gave his first lecture at Chatham House in the UK.
These were the Opposition leader's first activities after he flew out of the country on Wednesday evening.
He had just declared he will not participate in the repeat October 26 presidential election and that wants a fresh process.
During the session with Webly, Raila wrote on Facebook that spiritual guidance is of utmost importance at this juncture in Kenya's history.
"I value greatly the wise counsel that [Welby, who is also] the principal leader of the Anglican Church, imparted when I paid him a courtesy call this morning."
A photo was shared on social media of the NASA chief giving his lecture at Chatham.
Opposition leader Raila Odinga gives his lecture at Chatham House in the UK, October 12, 2017. /COURTESY
The NASA chief also met former UN deputy secretary general Mark Brown for discussions which "yielded valuable insights into Kenya's political situation".
Other details of Raila's trip to the US are not known as officials from the former Prime Minister's office declined to comment on the trip.
Regarding the election, IEBC noted Raila, who is President Uhuru Kenyatta's main challenger, had not yet submitted the official form for withdrawal.
Raila only sent a letter after announcing his pullout.
IEBC also said on Wednesday that all eight presidential candidates who competed in August will be on the ballot.
The decision followed a High Court ruling concerning Thirdway Alliance presidential candidate Ekuru Aukot.