Critics claim Southgate is getting more from Rashford playing him centrally, but Hurst told Tribalfootball.com on behalf of Grosvenorsport.com: "I think you can't claim that Marcus Rashford is a striker as such because his goal tally for Man Utd - and he's not a regular there - and of course for England, needs to be improved."
Hurst, who is the only player to score a hat-trick in a World Cup final, says Rashford needs to prove himself as a consistent goalscorer before being regarded as an out-and-out striker. The England icon scored 180 goals in 411 games for West Ham United.
Rashford has managed two goals so far this season and just seven in the Premier League last term.
Hurst continued, "When you start talking about strikers, you are talking about strikers who, in terms of the games they play and the goals they score, it's probably one in two. All the great strikers are around that level of consistency. He hasn't achieved that yet.
"I think also additionally to being a striker, he's not playing regularly for Man Utd."
However, Hurst is keen for critics to remember Rashford, despite his time in the game, has only just turned 21 years of age. He is in his fourth season at the top level.
"He's still improving and has a lot to learn by playing for the national team. But he has time to improve.
"But at the moment he is still in what I would call the 'prospect' stage. To start talking about him as one of the great players, he has to continue to improve both at Man Utd and England."
Watch the full interview below:
Grosvenor Goals is the free-to-play game where, each week, entrants have the chance to win £1 million if their 10 chosen players are all first goal scorers.
The game will also offer £10k for anyone who predicts 10 anytime goal scorers from their selections, with a £10 free bet to those who successfully pick three or more first scorers each week.
England legend Sir Geoff Hurst will play his part too – if he selects four or more first goal scorers in a game week, all users who play Grosvenor Goals that week will win a £10 free bet.To keep up to date with Sir Geoff's picks every week, follow Grosvenor Sport on Twitter.