Uh oh.

Ultimate Fighting Championship (UFC) heavyweight hurter Shane Carwin recently suffered a knee injury during wrestling practice and was forced to withdraw from his autograph signing across the pond during this weekend's UFC on FUEL TV 5 event in Nottingham, England.

That's the bad news.

The good news is, a report from MMA Weekly indicates he suffered no major damage to his knee and is still expected to compete against noshing nemesis and fellow coach Roy Nelson at The Ultimate Fighter (TUF) 16 live finale in Las Vegas, Nevada on Dec. 15, 2012.

So why worry?

Well, for starters, Jose Aldo also got injured prior to UFC 153 on Oct. 13 in Rio and said he was not hurt and good to go -- a week before pulling out of his fight against Frankie Edgar. Also keep in mind that Father Time has been an abusive dad, leaving Carwin with multiple surgeries and other physical ailments after years of competing as an athlete.

It's one of the reasons the 37-year-old "Engineer" hasn't seen the inside of a cage since getting popped and dropped by Junior dos Santos back in June 2011. Let's hope the former Interim champion can take things slow and steady until he's back to 100 percent.

For more on his upcoming fight against "Big Country" click here.