Fremantle defender Michael Johnson has been ruled out for the remainder of the season due to an Achilles injury.

Johnson has not played senior football since injuring his hamstring in Round 5 against Carlton.

He was on track to play again this year according to coach Ross Lyon, however, he has since suffered a setback in the form of a minor Achilles injury.

Lyon confirmed today that Jonhson will not play again this season.

"He was right on track two weeks ago, and he was training," Lyon said.

"He was just a bit sore in his Achilles.

"There's nothing wrong with the tendon. It's just a bit of a sheath issue. It means he's been interrupted enough now that he won't get to the line this year.

"He was ahead of Aaron (Sandilands). So it put him back two weeks, by the time he gets moving, he'll just roll into summer. It's disappointing for Michael and us."