"Whether or not he is capable of becoming a head coach is questionable, " Lewis told BBC Radio Wales.
Nothing in Mr Medvedev's behaviour so far suggests that he is capable of such a step.
And McCullum was soon playing the sort of dominating innings he is capable of, when given the chance.
"Mickelson showed on the PGA Tour (at Pebble Beach) that he is capable of playing fantastic golf, " he said.
Quiet by nature, Samuel will have to show against England that he is capable of leading the defensive line.
Weir believes he is capable of playing for another year for Rangers but says the decision will be the manager's.
"I think that everything will depend on him playing pretty regularly in the first team, which he is capable of doing, " O'Neill added.
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My guess is that Noda feels that he is capable of being his own finance minister, and Azumi will simply act as his agent.
Earls will want to get hold of the ball very early so he can show Lions supremo Ian McGeechan what he is capable of.
And the added responsibility of managing the club as well as keeping goal is a challenge he believes he is capable of meeting head-on.
He is very keen to tour because he wants to prove he is capable of running a game and showing the maturity expected from an international fly-half.
She said his physical condition would deteriorate over time and he would develop wasting, skin sores and muscle tightening which would cause pain if he is capable of feeling.
The best way that he can shake any reservations coaches, players and supporters may have is by getting on the field 100% fit and showing everyone what he is capable of doing.
George W. Bush has dominated the race to this point in great measure because Republican donors believe he is capable of taking back the White House, and preventing the loss of Congress.
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In his interview last week with Channel 2, Prime Minister Binyamin Netanyahu said he has no doubt that if Obama wishes to stop Iran from acquiring nuclear weapons he is capable of doing so.
He is capable of playing a full match.
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If this had been the Ryder Cup, I would have expected Garcia to have turned up the heat and played some of the flamboyant shots we know he is capable of, but perhaps they are taking it easy.
"He is someone who is capable of thinking on his feet, so he could be a formidable witness and he could be his own best advocate, " said Roland Riopelle, a white-collar-crime defense lawyer in Manhattan.
Is he somebody who is capable of widening his group of advisors, loosening that central control?
But he is also capable of taking a broader, strategic view of enlargement.
His appearances on 60 Minutes and other programs show that he is quite capable of representing the company in public.
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Hamann believes he is still capable of at least one more season in England's top flight, but says if nothing does come up then he would consider a career in coaching.
Richards will have to convince the Rangers, or any other team that might be interested in signing him should New York let him go, that he is still capable of being a productive player.
"From everything I've been able to discern about Warren Jeffs, he is someone who is capable of some very different things, " Jim Hill, an investigator in Utah's attorney general's office, told The Guardian newspaper.
"People talk about his age but he is definitely capable of staying at the same level for two more years until the World Cup, " added Shilton, whose domestic career included spells at Leicester, Stoke, Nottingham Forest, Southampton and Derby.
The idea that it could betray him, that there is nothing he can do to sufficiently fix it now, is not something he appears capable of thinking.
Finally, enough gloss had rubbed off on him that he is now deemed capable of anything.
Is he capable of wielding American power without making war?
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