SAN FRANCISCO – The good news for the 49ers: They don't have a lot of time to dwell on Sunday's lopsided loss to the Giants.

After a quick review of film this morning, they will turn their attention to NFC West rival Seattle, which visits Thursday.

The 49ers (4-2) share the division lead with Arizona and Seattle, which beat New England on Sunday.

"If we let this one linger, it can go into (Thursday's) game, and we don't need that," safety Donte Whitner said. "We don't need two (losses) in a row. So we have to quickly forget about this one."

The short week, however, means the 49ers are unlikely to play with left tackle Joe Staley, who suffered a concussion in the third quarter.

With Staley out, right guard Alex Boone moved to left tackle, and Leonard Davis took Boone's spot at guard.

Staley also suffered a concussion last year in a Dec. 11 loss to Arizona. Coach Jim Harbaugh had no projection for Staley's return, saying, "That's all in the hands of the doctors."

Mild salsa – The feud between 49ers cornerback Carlos Rogers and Giants wide receiver Victor Cruz simmered considerably after Cruz revealed his salsa dance end zone routine honors his late grandmother.

When that was relayed to Rogers last week, he quickly decided not to mimic the dance as he did last season, drawing Cruz's ire. Rogers also approached Cruz before the game.

"We talked about it a little bit," Cruz said. "He's a stand-up guy. He came up to me and said he understood why I do the salsa and what it means to me.

"He asked me if I got the message earlier in the week, and I said, 'Yeah.' I told him he was a real good dude for that, and we went about our way."

Cruz had a big game against Rogers in the NFC Championship Game but never made it to the end zone. He did his dance for the first time at Candlestick Park after a six-yard score in the second quarter Sunday.

Not so special – The 49ers entered Sunday's game ranked 30th in the league in kickoff coverage and likely will slip further after allowing a 66-yard return to start the second half.

"We got a few new guys," linebacker Larry Grant said. "We're still trying to find our niche and jell a little better. … The good thing is that everything is put on film. We've got to go in (today), check it out and see where we have to get better."

Kicker David Akers also has struggled lately. He missed two field-goal attempts against the Giants, from 43 and 52 yards. Akers is 6 of 11 on field goals in the last four games.

Et cetera – Tarell Brown's blocked field-goal attempt in the second quarter was the first of his career and the first by a 49er since Ray McDonald did it against Minnesota on Sept. 27, 2009.

• Aldon Smith had a chance to tie Reggie White by accumulating 20 sacks in his first 22 games. Smith, however, was held without a sack for the second straight game, leaving him with 18 1/2 for his career.

• The 49ers' three points were their fewest since Harbaugh took over as coach in 2011. The previous low was six in a Thanksgiving loss to Baltimore.

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