Keenan Allen may be feeling deja vu in 49ers debut against Cowboys

Keenan Allen is set to make his San Francisco 49ers debut against Dallas, just a week after playing the Cowboys for the Indianapolis Colts. The 34-year-old receiver was traded for a sixth-round pick and is expected to take on a larger role while several 49ers receivers are unavailable.

Allen has had only a few days to learn Kyle Shanahan’s complex playbook, which he said left his head spinning. He caught four passes for 26 yards in the Colts’ 27-23 defeat by Dallas last week; the article says only one other player is known to have faced the Cowboys in consecutive weeks after a trade, in 1963. Allen may also miss his usual bye week, extending his season, and says the repeat opponent offers little advantage because San Francisco uses different terminology.