Sources: Ravens starting center Jovaughn Gwyn out for 2-3 months

OWINGS MILLS, Md. -- Baltimore Ravens starting center Jovaughn Gwyn is expected to miss two to three months with a fractured fibula that will likely require surgery, a source told ESPN's Jeremy Fowler on Wednesday.

Gwyn was carted off the field during the Ravens' 34-31 win over the Dallas Cowboys in the NFL's first game in Rio de Janeiro.

With backup center Ethan Pocic (knee) also injured, Ravens coach Jesse Minter said Monday that rookie first-round pick Olaivavega Ioane is preparing to make his first start at center for Sunday's game against the Tennessee Titans. Ioane, the No. 14 pick in this year's draft, has started the first three games of the season at right guard.