Son has been selected to start up front on occasions in Europe, when Mauricio Pochettino has opted to rest Harry Kane.
However, the South Korean has not convinced Gale - who doesn’t believe he has the ability to play as a lone striker.
“The striking department is the most important,” Gale said. “They have played Son up-front in Europe, but he isn’t quite good enough for me, in that position.”
Son could start for Spurs against Borussia Dortmund later this evening, if Pochettino does opt to give Kane a rest.
The 23-year-old has scored five goals in 31 matches so far this season for Spurs, but he has generally been used as a winger, rather than a front man.
Tottenham still only have one out-an-out striker in their squad, and Tony Cottee believes that they missed a trick by not signing a new centre-forward in January.
“I’m surprised they didn’t get another striker in the transfer window,” Cottee said. “We know how good Harry Kane is, but he can’t play every game.”
Kane has played 40 times for Tottenham so far this season, and he has managed to notch 20 goals during that time, to enhance his reputation even further.