Speaking to the media, Slot said: "I invited him [Klopp] to the [Manchester] City and Real [Madrid] home games but he told me he was somewhere else in the world.
"He can come here any time he wants, to the games or even to this building [at the training ground in Kirkby].
"For me, he is more than welcome. In the first half of the season he was enjoying life, with his wife, and at this moment he has a job to do."