A two-time Pro Bowler, McBriar has career averages of 45.4 (gross) and 38.0 (net). Mesko left Pittsburgh with averages of 42.5 (gross) and 36.7 (net). His net average ranked 29th in the league.
McBriar spent last season with the Philadelphia Eagles, and when he kicks Sunday he'll be the seventh full-time punter employed by the Steelers since Dan Sepulveda was drafted in the fourth round of the 2007 draft.
"He's got to play better from an assignment standpoint," Tomlin said of Jones. "If he's still capable of showing that, he'll be given an opportunity to contribute now."
According to ProFootballFocus.com, Worilds already has logged more defensive snaps (258-209) than Jones, and according to the Steelers, Worilds has the only sack of the two rushmen while both have 19 tackles.
When asked if Jones was struggling or regressing, Tomlin said, "He's just not doing enough detail work right now and, really, Jason Worilds is. That's just the reality of it. Part of playing really good defense and playing really good football period is having detail with your work, and there's more detail in Worilds' work right now."
Tomlin had some good news on the injury front when he reported that all three offensive linemen who left Sunday's game could be available for this Sunday's game in New England.
RG David DeCastro (ankle) appears to be the more questionable of the three, since LG Ramon Foster (concussion) has been cleared to practice and reserve T-G Guy Whimper (hyperextended knee) is expected to practice Thursday.
If DeCastro can't play Sunday?
"(Guy) Whimper and (Cody) Wallace are strong candidates," Tomlin said. "We like what (Kelvin) Beachum is doing at left tackle. But we'll deal with that as it comes up. We're still not resigned to the fact that DeCastro is not going to play. We're going to give him an opportunity to do so."
Tomlin also said that rookie WR Markus Wheaton (finger) could return after missing three games.