Die Roten announced earlier this week that Guardiola would replace current coach Jupp Heynckes at the end of the season, ending speculation that the Spanish coach might head to the Premier League after his sabbatical.
The move caught many off guard, and Robben revealed that he was no exception when he spoke to reporters after Bayern's 2-0 win over Greuther Furth as the club's season resumed on Saturday.
"I was surprised, also because it happened really quickly," Robben said. "One day before he signed I read that he was looking forward to working in the Premier League. A day later he signed at Bayern. It was surprising but good."
Bayern currently leads the Bundesliga by nine points over second-placed Bayer Leverkusen, and several of Robben's teammates, such as defender Daniel van Buyten, have stressed the team needs to avoid being distracted by the news.
"We are proud, because he [Guardiola] is one of the best, maybe the best coach and he chose the best club," van Buyten said. "But this is in the future. Now we want to deliver a good second half of the season. We do not want to speak a lot about the future.''
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