Thunder G Thabo Sefolosha out 4 to 6 weeks with calf strain

Oklahoma City Thunder shooting guard Thabo Sefolosha

Greg Smith/Greg Smith-USA TODAY Sports

OKLAHOMA CITY — Caron Butler better get here in a hurry.

Less than a week after the Thunder announced starting center Kendrick Perkins would be out for six weeks with a strained groin, general manager Sam Presti said starting guard Thabo Sefolosha would be out for four-to-six weeks with a strained calf muscle.

Meanwhile, OKC signed Caron Butler to a free agent contract and he was on his way to Oklahoma City Sunday and should practice with the team Monday. Butler likely will play Tuesday at home against Philadelphia.

"He may come back a little sooner, he may come back a little later," Presti said Sunday before the Thunder played Charlotte. "We’re going to say four-to-six weeks."

Perry Jones started in Sefolosha’s place Sunday. It was Jones’ second start of the season.

Weather kept Butler from joining the team on Sunday, and Chesapeake Energy Arena was only about 60 percent full. Oklahoma City was hit with freezing rain and ice on Saturday night and much of Sunday.

Follow Andrew Gilman on Twitter: @andrewgilmanOK