Former Wimbledon champion Richard Krajicek believes Ivan Lendl can be the missing ingredient Andy Murray needs to win a third grand slam title.
Krajicek is the latest ex-professional to join a growing group of 'super-coaches' after he agreed to help world number five Stan Wawrinka during the grass-court season.
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Wawrinka, like Murray, has two major triumphs to his name but the Swiss has never found his best at Wimbledon, the only grand slam where he is yet to reach the semi-finals.
Murray has won the title once at the All England Club, but his hopes of repeating his historic 2013 victory may rely on beating Novak Djokovic, to whom he has lost 13 of their last 15 meetings.
The last defeat came in the French Open final earlier this month but Krajicek, who won Wimbledon in 1996, believes Lendl could prove the difference.
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"It could well be because he was so close at the French and he just needs a little bit more," Krajicek said.
"Maybe Lendl, just having him there, maybe if he would not say anything for next couple of weeks, just sit there, maybe that's the last piece of the jigsaw.
"It's really close and I think he also believes that or he would not ask him to come back."
Murray enjoyed a successful two-year spell with Lendl from 2012, when he won Olympic gold and his first major titles at the US Open and then Wimbledon. Krajicek believes the reunion makes sense.
"Lendl was a really hard worker and Murray is that as well so there was a good match," Krajicek said.
"And I think Lendl, it took a long time for him to win his first major. A lot of time. And with Murray, he had a few very good results, a couple of grand slam finals, and maybe in the press and also himself start to believe, like, 'am I ever going to win a grand slam?'
"I don't know what Lendl said to him, but apparently he really started to believe in himself. I think they are a great match, and I think it's very smart that they work (together) again."
Krajicek's focus now turns to Wawrinka, who begins his Wimbledon preparations against Spain's Fernando Verdasco in the first round of the Aegon Championships at Queen's.
Wawrinka is coached full-time by Swede Magnus Norman, himself a former world number two, but Krajicek could stay on depending on the relationship's success and family circumstances.
"Magnus said, 'look we want some extra help on the grass and Stan is really open to it'", Krajiceck said.
"Also Stan said a little bit the same thing, that he has a feeling that I can add to his game and that it's the only grand slam he never made the semi-final.
"So when somebody is ambitious and he's got the huge game - I don't know if unlucky is the right word, but last year he could and should have made the semi-finals - he has the tools of course to beat anybody and to hit anybody off the court like he did even on clay last year with Novak at the French Open.
"It was his ambition and also just the talent he has to really improve on his game."