General View of the Ibrox Stadium
Hardie, who is 19 years of age and plays as a striker, has left Scottish Premiership side Rangers to move to St. Mirren on loan.
As announced on the Scottish Championship outfit’s official website, the teenager has joined them on loan until January 2017.
Former Rangers star Johnstone believes that leaving the Gers for St. Mirren on a loan deal is a good move for Hardie.
The 62-year-old former Scotland international has also strongly advised the youngster to make the most of his spell away from Ibrox and impress Rangers manager Warburton from afar.
General view of Ibrox
“It would be natural for Ryan to think if he is ever going to get a game for Rangers, especially if Mark looks to add to his squad again in January and then next summer as well,” Johnstone wrote in The Glasgow Evening Times about Hardie.
“He has to go to St Mirren, play every week and score as many goals as he can. It is a really big season for Ryan.
“He is a good young player but he has to prove himself this year and show that he has what it takes to come back to Rangers and challenge for a first team place.”
Rangers manager Mark Warburton
Hardie is a talented young striker, and it makes perfect sense for him to spend some time away from Rangers.
The 19-year-old was unlikely to get much playing time for the Gers’ first team this season, at least in the opening months.
The youngster is probably not yet ready for the Scottish Premiership, and playing the first half of the season in the Scottish Championship will help him develop as a footballer.
Rangers' manager Mark Warburton