WITH most players, the challenge for the manager is finding a way to switch them on.

With Emilio Izaguirre, it's the

exact opposite.

Ronny Deila is still searching for the pause button, concerned that the 28-year-old's perpetual motion might put him at risk of burnout.

Saturday saw Izzy play his 200th game for the Hoops.

It is no exaggeration to say that, since he arrived at Celtic in 2010, the only thing which has stopped the full-back was a

broken leg in his second season.

The rest of the time, he has defied logic - and sometimes his managers - to give a Duracell Bunny-type impersonation of never stopping. He ended last season having played almost every game for Celtic before taking one of his very many flights across the Atlantic to join up with the Honduras squad preparing to take part in the World Cup Finals in Brazil.

That done, he quickly flew back to join his team-mates in their pre-season work, then threw himself into the qualifiers for the Champions League, the prelude to yet another season where he has achieved a near-perfect attendance record in the Hoops' 52 games to date.

In fact, he has already played 50 games for Celtic this season, more than in any of his previous campaigns - and there are still at least eight to go. At the same time, Izzy has been zipping back and forth across the pond to help Honduras qualify for this

summer's Gold Cup.

Therein lies the dilemma for Deila, because the finals are scheduled to be played in the United States and Canada from July 7-26 - the same time Celtic will kick off next season's quest to book an £18million ticket for the Champions League Group Stage.

The plan is to give all of his players three weeks off when this season finally comes to a close.

This weekend's Scottish Cup semi-final against Inverness will determine if that will be with the final SPFL game on May 24, or with the cup final on May 30.

The complication comes with those players who will still be representing their respective countries on the international date, June 13. So another staggered return for pre-season is being planned, with the aim to have everyone up and running for the first of the qualifiers on July 14.

Still licking his wounds from the failure to qualify last summer, Deila is putting a lot of planning into getting it right this time.

But Izaguirre's unique situation is one which is giving him most food for thought. He knows that, if possible, the player would vote to play in every game for club and country.

That's simply his nature. But protecting him from his own over-exuberance to ensure he can give his best for the entire season is the manager's priority.

So a plan for Izzy's summer, and whether it can include Concacaf Gold Cup football and chasing the golden ticket with Celtic, is being formulated.

Deila explained: "I have not talked with Emilio about this yet. But the most important thing is that he needs rest."He played last summer in the World Cup Finals, and almost all of our games this season. We will see what is happening, but he needs a good vacation now."

In seasons - and managers -gone by, the opportunity has been taken to give players time off before the season ends.

However, that was easy to facilitate last year as the title was sewn up before the end of March. This time, it's still very much a contest, with Aberdeen closing the gap to five points at the weekend after Celtic drew at Inverness. Left-back is also the position in the team for which Deila has fewest options, another reason why Izaguirre plays so many games.

However, the manager is looking seriously at bringing in cover during the transfer window.

And, he revealed, he believes he might have a short-term solution, as the appearance of 17-year-old Kieran Tierney on the bench at the weekend confirmed.

"We have to get more cover for the left side of the team," said Deila. "We do not have many options who are left-footed.

"KT is coming up, and he can be an option. But we are following this situation very closely, of course."

Tierney has already made an impact with the Development Squad, not least when he scored from the edge of his own penalty box in game against Hearts in October.

The quick bit of thinking and perfect execution came after the visiting keeper stepped forward to launch a free-kick from just inside his own half, and has become a YouTube hit. But Tierney has caught the eye of the manager for his overall performances and development.

The Wishaw teenager first came to the Norwegian's attention soon after he took over from Neil Lennon, and was sent to Helsinki in

August with the shadow squad which played Spurs in a friendly.

John Collins, in charge for the day, sent him on when the London club went four in front on the hour mark. Tierney, who has been at Celtic since he was seven, admitted at the time it was all a blur.

"Before I came on, I wasn't even thinking about the score," he said. "All I had in my head was that I was playing for the team I've always loved and supported.

"I just heard the shout for me to warm up. But I just froze. I didn't know what to feel. It was just unbelievable. It's been my life's ambition to play for Celtic."

That brief taste left Tierney wanting more, and Deila could be ready to give him that chance in the next few weeks.

He said: "Kieran is very talented boy. He has something extra. Hopefully, we can try him in the next few games.

"It's not easy to bring in young players because every game is so important for us. But he shows in training that he is someone to

really, really look at."