Cornerback Bryce Callahan will have his Denver Broncos debut pushed back fourto six weeks after having a non-surgical procedure on his left foot, according to head coach Vic Fangio.

Fangio added that injured reserve remains a possibility for Callahan, who practised on a limited basis in eight of nine practice sessions through the first three weeks but has yet to suit up for a game.

NFL Week Four on Sky SportsPick Six: Week Three

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Callahan, 27, fractured his foot last season with the Chicago Bears, missing the final three games after having surgery.

He participated fully for much of the off-season, but had the same foot stepped on during training camp in August, keeping him out of the pre-season and now into the regular season.

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“He’s still having complications from the injury he had last year and the surgery he had after the injury,” Fangio said.

The Broncos signed Callahan to a three-year, $21m contract in March, reuniting him with Fangio after the two spent four years together in Chicago.

In four career seasons, Callahan has four interceptions and 20 pass-breakups in 45 games (29 starts). With Callahan out, safety Kareem Jackson has worked primarily at nickel cornerback through three weeks.

Meanwhile, defensive end Derek Wolfe’s ankle injury sustained on Sunday in Green Bay was not as serious as the team anticipated.