Del Zotto notched an assist in Monday's 5-2 defeat to Washington.
Del Zotto signed a one-year contract with the Ducks on Thursday, Renaud Lavoie of TVA Sports reports.
Del Zotto notched a helper versus Detroit on Thursday.
The Ducks traded Del Zotto to the Blues on Monday for a sixth-round draft pick, Elliott Teaford of The Orange County Register reports.
Del Zotto was scratched during Saturday's loss to Toronto.
Del Zotto scored his first goal of the season in Saturday's loss to Montreal.
Del Zotto has sat out the past two games for Vancouver.
Del Zotto posted a minus-4 rating in Tuesday's 5-0 loss to the Ducks.
Del Zotto collected an assist in 20:11 of ice time in Tuesday's win over Calgary.