Although the Giants are expected to cast a wide net in their search for a new defensive coordinator, a source predicted that Spagnuolo will be considered as an option.
This year, Spagnuolo led the Ravens' injury-riddled secondary through a tough season in which they finished ranked 24th in pass defense after ranking 31st at one point.
Spagnuolo lost five cornerbacks to injured reserve, including top cornerback Jimmy Smith with a Lisfranc foot sprain.
He's had to shuffle his personnel alignments on an almost weekly basis.
Spagnuolo was a head coach with the St. Louis Rams before spending one year with the New Orleans Saints as their defensive coordinator. After being fired by the Saints, the Ravens hired him as a senior defensive assistant.
The Ravens named him assistant head coach prior to this season. He replaced Teryl Austin as secondary coach when Austin was named the Detroit Lions' defensive coordinator.