As Jon Gosselin prepares to face off against TLC in court on December 14, his allies and new enemies are being called on to testify as witnesses for the TV network, which produces Jon and Kate Plus 8. While Jon is reportedly filing a $5 million countersuit against TLC, an insider tells BettyConfidential that Jon’s biggest concern is what Michael Lohan will say on the stand.

“Jon really allowed Michael into every bit of his life,” the insider says. “Michael came to the house, met the children and was the force behind getting Jon to put the brakes on the TLC show being renamed Kate Plus 8.”

The source says Michael put many ideas into Jon’s head, including comparing Kate and the kids to Dina, Lindsay and his other children. “Michael was giving Jon specific advice about his family with warnings about working peacefully with Kate, and how to try to avoid a public battle like he has with Lindsay,” the insider says.

“Michael told Jon to look at his family and make them the real priority now, ending the show for their sake. He was quick to use Dina and Lindsay as references and he willingly offered advice to Jon about how to avoid the mess he's dealing with now. But most of his advice backfired for Jon.”

As BettyConfidential reported last week, Jon has cooled his friendship with Michael, who had hoped to star in a TV show together with Jon called Divorced Dads’ Club, but now that he’s been frozen out, there’s no telling what Michael will say on the stand. As we’ve seen lately in his outbursts about his daughter Lindsay, Michael is a loose cannon. And that’s just what Jon is worried about.