I also read from the same report, namely Fabrizio Romano. he reported several tweets, which suggested that Alonso would stay with Bayer Leverkusen. quote that a few hours ago, Xabi Alonso had a good meeting with Bayer Leverkusen and told them that he will stay and remain at the club. which means Alonso won't be going anywhere next summer, whether it's to Bayern Munich or Liverpool. Alonso remains with Leverkusen, he even said that this is not the time to decide his future, he wants to develop at Bayer Leverkusen.
If this report happens to be legit, then this is a very nice decision made by Alonso, being in ghaste to leave Bayern Leverkusen after building such a formidable team wouldn't make sense, at least he should spend one or two more seasons with the club because going to another club after the season ends ,he would have to start building a team with that new club and this isn't something easy to because you need to master things with the new club, even sometimes it might even take a couple of years before some coaches gets to understand things with their new clubs, and if it happens to be an impatient club like that of Chelsea who don't normally have patient with their manager, he will be sacked almost immediately if there no results with the team.