Liverpool's resilience has been a huge factor in Robertson's impressive season, the Reds recording a league-leading 20 clean sheets.
But it is his creative ability that makes Robertson a standout pick. His 12 FPL assists are more than any defender in the game and rank fourth overall, level with Mohamed Salah (£13.3m).
He is second only to Robertson for assists in defence, with nine.
Both Liverpool defenders sit above Sergio Aguero (£11.9m), the top-scoring forward with 193 points.
At the start of the season, Robertson and Van Dijk cost a combined £12.0m, compared with the £11.0m for Aguero.
Their success could force a change of tactics from Fantasy managers next season.
Those who spend big on premium attackers may reconsider the potential on offer from Liverpool's defence.
Robertson will again be the standout contender, with Alexander-Arnold pushing hard as the double-up option.