Debra will be playing a social worker named Linda, who will cross paths with Randall (Sterling K Brown) and his wife Beth (Susan Kelechi Watson) as they plan to adopt a child, reported Ace Showbiz.
Debra is set to appear in several episodes of the sophomore season.
She will join previously-announced season 2 guest star Sylvester Stallone, who is playing himself on the hit NBC show.
The "Rocky" legend will portray Kevin's (Justin Hartley) co-star in a fictional wartime movie directed by Ron Howard, who will also play himself.
"This Is Us" season 2 will air next month.
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