Robertson, who signed from Hull City, was the only defender Liverpool manager Jurgen Klopp added to the squad during the close season but the Scot has yet to earn a regular spot in the starting side.
The 23-year-old has played twice in the league, the win over Crystal Palace and the draw with Burnley, but has watched Liverpool concede 11 goals, one less than they have scored.
"The threat we've got going forward, the counter-attacks are frightening at times. If we can just shore up at the back and not concede silly goals and not switch off then we'll be a big force," said Robertson.
"I do believe as a group we can get better defensively and I can be part of that," he added. "As a group, we have to work together to get better defensively because, if the midfielders can help us and the strikers can help us, then as a team we'll improve."
Fifth-placed Liverpool are at Newcastle United in the Premier League on Sunday.
There has not been a goalless draw in 44 previous league meetings between the sides.
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