Keano explained in The Sun: "Brian Clough famously lasted just 44 days at Leeds but, as he went on to prove, that did not make him a bad manager.
"I'm not saying he's going to turn Tottenham into European champions like Clough did with Nottingham Forest, just that his time in charge at Stamford Bridge need not define him as a manager.
"I do see similarities between Villas-Boas' time at Chelsea and Clough's Elland Road stint.
"Both had impressed in their previous jobs before moving on to a bigger challenge.
"The pair tried to stamp their authority on dressing rooms where there were some well-established players who had already achieved considerable success.
"It didn't work out for either of them but it doesn't mean that they should never get a chance in the dugout again."