Juuso Valimaki's torn ACL is forcing the Calgary Flames to scour the trade market for reinforcements on the blue line.

General manager Brad Treliving said Monday that the team will look for external help on defense on top of identifying internal options, according to Sportsnet's Pat Steinberg. Treliving noted that Oliver Kylington is a natural internal option, but said the club will also start looking at trade options shortly.

The top four is seemingly set in stone, although both Brodie and Hamonic are on the final year of their contracts.

Valimaki, the 16th overall pick in 2017, was expected to be a big part of the team's defense this year after skating in 24 games during his rookie season.