"There's no one better than Harry Kane so if he carries on playing international football, which I don't doubt he will, then it'll be very, very difficult for Watkins or Solanke to push him to one side," the England legend told Betfair.
"It'll probably be more of a bit-part role if Harry gets injured or needs to come off. That'll be the role for Ollie Watkins and Dominic Solanke until Harry Kane decides it's time to go.
"The thing is, England are not blessed with several great centre forwards. I harp on about this a lot, but when I go back to my time in the Premier League and look at the list of centre forwards then compared to what there is now – and I know the role has changed a bit - but there's a dearth of talent in that No.9 area amongst English players."