Lamela struggled with injuries in his first season in the Premier League in 2013-14 and was frustratingly inconsistent in 2014-15.
The Argentina international has been playing well this campaign, though, and appears to have finally found his feet in England.
The 23-year-old has scored two goals and created 24 chances in 10 league matches so far this season.
The former AS Roma star has a pass accuracy of 83% and a shot accuracy of 56%, and has won two headers, 10 dribbles and 15 tackles.
Former England international Keown has admitted that he is surprised by the improvement shown by Lamela, but he still does not rate him as highly as he does Arsenal midfielder Aaron Ramsey.
“I have been surprised by Erik Lamela’s improvement but he still wouldn’t get in ahead of somebody like Aaron Ramsey,” Keown told The Daily Mail when asked how many Tottenham players would get into the Arsenal team.
Keown has also predicted Arsenal to win the North London derby against Tottenham at the Emirates Stadium on Sunday.
“I can’t go for anything other than a home win,” said the Englishman. “2-1 to Arsenal.”
Arsenal are second in the Premier League table at the moment, while Tottenham are five points behind them in fifth.