Alli has hit top form in recent weeks, helping Tottenham rise to second in the Premier League.
The 20-year-old has scored 13 goals this season and signed a six-year contract at the club back at the start of the campaign.
Spurs' unbeaten run in 2017 has seen them pick up 14 points from a possible 18 in the league.
Liverpool training ahead of Tottenham clash
Thu, February 9, 2017
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Liverpool have to look out for him
King on Alli
Liverpool, meanwhile, are yet to claim a top-flight win since the turn of the year.
And former Spurs defender King believes Alli could be the difference in Anfield tomorrow (5.30pm).
"He's a talented young player, started the season a little slow but has found his feet," King told talkSPORT.
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Dele Alli has been one of Tottenham's star men this season
Alli played against Liverpool in the 1-1 draw earlier this season
Alli has scored 13 goals for Spurs in all competitions this term
"The change of system has helped him with three at the back, it's freed Alli up a bit.
"He's great at arriving late in the box and finishing.
"He's taken that into the Premier League and onto the international stage.
"He's in terrific form and Liverpool have to look out for him."