0355 GMT January 19, 2020
"We are polite guys, why not?" Guardiola said Sunday when asked if the pair would extend hands, despite an acrimonious rivalry which stretches back to 2010 when the Catalan had stewardship of Barcelona and Mourinho took the reins at Real Madrid, AFP wrote.
"Why should we not shake hands? No reason why. He will want to win and so will I, that’s all," the City boss told a news conference after training at the Olympic Sports Centre ahead of the International Champions Cup preseason tour match.
"It's a friendly game, a really friendly game."
Since taking on their respective Manchester football giants, each manager has insisted they will not concentrate on each other too much.
But Guardiola acknowledged that United would mount a serious challenge in the English Premier League after a period in the doldrums since the retirement of Alex Ferguson in 2013.
"I'm pretty sure they will be stronger than in previous years," said Guardiola.
"With this manager I’m sure they will buy new players. They will be a strong team."
Sunday's training session was switched hastily to the smaller Olympic Sports Center to preserve the famous Bird's Nest stadium's pitch following days of storms in the Chinese capital that have left the ground saturated.
The first Manchester derby outside the UK will be played at the centerpiece of the 2008 Beijing Olympics on Monday night, weather permitting. More than 200 people have died in flooding in northern provinces surrounding Beijing.