Pollard scored 18 points in the most recent match against Scotland at Murrayfield.
South Africa's World Cup winning fly-half Handre Pollard will be the new fly-half for the 2022-23 season.
At the weekly press conference, Borthwick declined to confirm the signing.
We're always looking to improve the squad. Borthwick told the radio station that it was nothing new.
We will look to bring in good players if we can.
There are things happening in the background and we have systems in place to look at that.
Pollard captained his country to second place at the Junior World Cup in New Zealand and then made his debut for South Africa against Scotland in a game that they lost.
He has gone on to take his tally of caps to 60, including a personal man-of-the-match haul of 22 points in the World Cup final victory over England in Yokohama in 2019.
Heading into Saturday's game with third-ranked Quins, the Tigers have won all eight of their games this season.
