The Aston Villa boss has been discussing his former midfielder.
The 23-year-old midfielder spent a number of years at White Hart Lane without making an impact on the first team, enduring several loan spells away from the club.
But, this season, Mason has made his breakthrough not only for Tottenham but national side England. He has been a regular under Mauricio Pochettino in the Premier League and recently made his Three Lions debut.
Sherwood, meanwhile, says Spurs didn't look to sell the midfielder as they saw his potential if he was able to develop one key quality: durability.
Now, according to the Villa head coach, Mason has got exactly that.
The Aston Villa boss told the Standard: “We didn’t want to sell Ryan Mason because we always felt that if he could get durability into his game, he’d do well. Now he’s an England international."
Sherwood will take his Villa side to White Hart Lane on Saturday afternoon as the Premier League side - battling against relegation - face the Tottenham team he managed last season. Ahead of the reunion, though, there appear to be no hard feelings - certainly from Sherwood's point of view.
Both sets of fans will be expectant: Aston Villa because they need a result, Tottenham because they need a performance.