Sonny Gray, who will start Tuesday against the Astros, probably will be dealt in the next six weeks and one of the more realistic landing spots for the A’s ace is….Houston.

Industry sources have mentioned the Astros in connection with Gray for weeks, there is zero doubting Houston’s interest, and the A’s front office has had no qualms dealing within the division. Especially with Houston, a frequent trade partner, including two years ago at the deadline when Oakland sent Scott Kazmir to the Astros. Astros general manager Jeff Luhnow just so happens to be in town for this series.

Gray has heard plenty of trade rumors in the past and, he said Monday, “It’s kind of the same stuff that’s been said for a long time now. You take all of it with a grain of salt because in the grand scheme of things, who knows what anyone’s really thinking.”

Should the Astros present the A’s with the best offer for the right-hander, perhaps the only concession that might come with trading a top starter to a division foe is that the teams might wait until after Oakland has faced Houston this week and next. However, there are numerous other clubs with interest, including one National League team that even has toyed with the idea of using Gray as a closer.

Susan Slusser is a San Francisco Chronicle staff writer. Email: sslusser@sfchronicle.com Twitter: @susanslusser