In his column for the Daily Mail, Keown wrote: "William Gallas has been given a second chance at Tottenham since leaving Arsenal and his performance against AC Milan was typical of his excellent form.
"As captain at Arsenal, it often seemed like he was in a rage. I remember him going crazy at Gael Clichy when he made a mistake at Birmingham three years ago. But now he seems to treat his team-mates in a different, more caring way and blends in better.
"As a result, this is arguably the best he has every played as a centre half. His mobility is his biggest asset, even though he is not quite as quick as he was in his Chelsea days. He reads the play well and is at that stage in his career when he knows the game inside out.
"That mobility and instinct is epitomised by the way he cleared off the goalline against Milan.
"Gallas was initially moving the wrong way, but he was able to change direction, stay balanced and clear the danger as Robinho jumped towards him - all in a split second.
"He is equipped to deal with playing against a big target man or a smaller, faster striker. He's tall and does well in the air and is mobile enough to deal with the demands of the modern game. You need to be quick.
"And with his ability to read the game on top of that, everything comes together to produce the performances he has been putting in recently."