Robertson, 31, has been a key player for Liverpool since joining in 2017, but has fallen down the pecking order following the summer arrival of Milos Kerkez.
It’s now been reported that Tottenham are in talks with Robertson over a move to North London, although an agreement is yet to be reached.
Speaking after their dramatic 3-2 defeat to Bournemouth on Saturday (January 24), Slot insisted that Robertson still has a role to play in his squad.
"I think I need all my players,” he said.
“Robbo had to come in at half-time, in my opinion. I always knew that for Milos, another 90 minutes against a very intense Bournemouth side was not a possibility for him, so I knew I would have to bring (Robertson) in.
"I had already had one substitution in the first half, then you only have two moments left, so I thought 'let's bring Robbo in at half-time to make sure Milos stays available for the rest of the season'.
"There's a lot of games to be played with the players available. I have to manage that as well. The last thing we could need right now is another injury."