Philip Rivers hasn't played in the NFL since 2020, but the 44-year-old quarterback is now attempting a historic comeback .

The Indianapolis Colts reportedly signed Rivers , who is a Pro Football Hall of Fame semifinalist this year, to their practice squad Tuesday after injuries to Daniel Jones , Anthony Richardson and Riley Leonard .

It's still unclear if and when Rivers could suit up for game action, but the 8-5 Colts could certainly use some help. Rivers retired after spending his final season with the Colts, leading the team to their most recent postseason appearance .

How unprecedented is Rivers' decision to come back to the NFL? It's not as uncommon as you think for future Hall of Famers to unretire, although his five-year gap is unique.

Here's a look at eight NF

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