The upcoming UFC on FX 1 took a hit recently as former WEC champion Mike Brown has been forced out of his fight with Vagner Rocha with a knee injury. While Brown did undergo arthroscopic surgery on his left knee to remove damaged cartilage and loose bone chips, the injury won’t keep him out of action long and he is expected to resume training in two to three weeks.

UFC officials have confirmed Brown’s removal from the card.

Five Ounces of Pain was able to catch up with Brown who explained his condition and offered up a prognosis on when fans might see him back inside the Octagon.

“I had arthroscopic surgery on my knee Thursday,” Brown revealed. “They removed some damaged cartilage on the inside and the outside of the knee. I also had a few bone chip floating around that the took out.”

“The knee has been bothering me for a while then two weeks ago I tore the medial meniscus pretty bad,” the 36-year old continued. “It wasn’t going to heal on its on. I needed it to be fixed so when they went in they kind of cleaned up the entire knee. I should have a full recovery three to four weeks and I’ll be ready to fight again by April.”

Brown got off to a rough start in 2011, losing back-to-back fights in January to Diego Nunes and Rani Yahya, both by decision. After taking a couple of months off to re-group, Brown returned to his winning ways at UFC 133, picking up a unanimous decision victory over Nam Phan.

No replacement has been found for Rocha, who will make his featherweight debut on the card.