De Vries has faced a rough first third of his rookie season, struggling to get on Tsunoda's pace as a lack of consistency has held him back across the first eight races.
He is one of two drivers yet to register points, alongside fellow rookie Logan Sargeant, although that is also partly due to an underperforming AT04.
Pressure on De Vries has already started mounting, with Red Bull advisor Helmut Marko voicing his displeasure about the 2020-21 Formula E world champion's performances so far.
Team-mate Tsunoda has backed De Vries to turn things around once he gets settled.
"I think Nyck just has to put it all together," Tsunoda replied when asked by Autosport in Austria about his new team-mate's plight.
"I think the pace is there, so he just needs to find a good rhythm because so far in most of the races probably he struggled a lot in terms of consistency.
"I think in the end he'll get there because in past races and past results, with what he achieved he's showing that he can do it, so I'm sure he'll get there."
Source: Autosport