Arsene Wenger believes there is an underlying reason for Aaron Ramsey's continuing injury travails - but Arsenal are still to find it.
Ramsey's promising career has been punctuated by injury.
The Wales midfielder was a substitute for Tuesday night's Premier League defeat of Leicester, but was replaced after only nine minutes due to a hamstring problem.
"We haven't found the underlying reason," said Wenger, speaking ahead of the holders' FA Cup clash with Middlesbrough on Sunday.
"There is an underlying reason that is medical or bio-mechanical, because he's a guy who is serious, works hard.
"There's no obvious reason why he should have muscular injuries."
Arsenal 2 Leicester 1 player ratings
Arsenal 2 Leicester 1 player ratings
1/22 David Ospina 6
He didn’t enjoy the runs of Schlupp or Mahrez but when he was tested by either of them he was good enough to prevent any sort of danger. He got very used to tame shots from outside the area that he collected every time.
2/22 Hector Bellerin 6
Attempted to get forward whenever he could and unlike against Tottenham he didn’t harm his defence because of it. He was guilty for not tracking Konchesky when the left-back burst forward down the left, though that was the only glaring error he made.
3/22 Laurent Koscielny 6
Opened the scoring for Arsenal and looked alert throughout the first half. He let the ball get away for him for Kramaric’s goal - similar to the way the ball got away from him when Kane scored the winner against Tottenham - but was untroubled other than that.
4/22 Per Mertesacker 6
Left his central defensive Koscielny with trouble to deal with on a couple of seasons but did brilliantly to get back and clear when it looked as though Schlupp would equalise for Leicester City. Cleared
5/22 Nacho Monreal 5
Saw more of the play in the second half as Arsenal chose to alternate the wings more often than in the first half. For some reason he does seem rather cautious when going forward; rarely going as far as the byline.
6/22 Tomas Rosicky 6
Did what he usually does: consistently linking up the attack, while occasionally looking to spread the ball out to the flanks. Never under much pressure from Cambiasso who was meant to have been marked by.
7/22 Francis Coquelin 7
Quickly becoming a revelation for Arsenal. Since the FA Cup game against Brighton and Hove Albion he has played in every match and is almost a permanent fixture in the Arsenal midfield. Very effective when faced with James.
8/22 Santi Cazorla 6
Surprisingly he found it particularly difficult against James and Cambiasso, who it appeared had been selected to monitor and close down the Spanish midfielder at any given moment. Unable to play with as much freedom as usual, he went a little missing in the second half.
9/22 Alexis Sanchez 6
A constant pest to the Leicester City defence on his first game back after a hamstring injury. Upson, before he went off due to injury, was having to endure a torrid time marking the Chile international. He wasn’t match sharp but that was to be expected. Replaced by Giroud with over 20 minutes to go.
10/22 Mesut Ozil 6
It was his shot that forced Schwarzer to the ground and allowed Walcott to smash home. And although he provided the corner that was finished off by Koscielny, he did appear a little casual at times and seemed to be playing within himself.
11/22 Theo Walcott 7
Brilliant initiative to follow up Ozil’s shot which was pushed into his path by Schwarzer who was ground when the winger smashed past him. He is definitely now back to full match fitness and Konchesky certainly wasn’t impressed to be the one with the job of marking him.
12/22 Mark Schwarzer 5
Difficult to blame him for the first goal but could have done a little better to stop the ball falling to Walcott who smashed past him for Arsenal’s second.
13/22 Danny Simpson 5
He was a little guilty of going inside to cover too often which allowed Ozil or Monreal a clear path to goal. He was lucky neither of them took advantage on several occasions.
14/22 Wes Morgan 4
Failed to mark Koscielny for Ozil’s corner and the France international subsequently sent Arsenal into the lead.
15/22 Robert Huth 6
In the centre of Leicester City’s five-man defence. He organised his back five well and when Giroud came on he didn’t give the France international enough space to create a nuisance of himself.
16/22 Matthew Upson 6
Replaced by Wasilewski in the second half after going off due to an injury. He had endured a tough time trying to keep Sanchez in his sights.
17/22 Paul Konchesky 6
Tried to get forward as much as possible. His brilliant pass in the first half required a full stretch clearance from Mertesacker to deny Schlupp the chance at scoring the equaliser. Unfortunately he didn’t have a quiet night with Walcott coming at him with pace.
18/22 Riyad Mahrez 6
Dangerous against Monreal but didn’t do enough to threaten Ospina in the Arsenal goal.
19/22 Matty James 7
His prime objective was to stop Cazorla being as creative and offensive as possible. He did that to great effect and was one of Leicester City’s best players on the night.
20/22 Esteban Cambiasso 6
Allowed to push forward a little more than James, the midfielder helped to win back possession whenever Rosicky was a bit clumsy. He helped to provide Kramaric with support but sometimes found himself bypassed in midfield.
21/22 Jeff Schlupp 6
Should have done better to get to Konchesky’s pass in the first half. Against strong opposition you have to take your chances and Schlupp failed to do so.
22/22 Andrej Kramaric 6
Too his goal brilliantly but should have equalised in the last ten minutes. His tame lob was swiftly plucked out of the air by Ospina. To his credit he never stopped working.
Wenger played down the severity of the problem which is expected to keep Ramsey out for a fortnight and insisted Arsenal's training methods are sound.
"It's not a major injury. It's a grade one," he added.
"We have individualised training. I don't think that is any special case that has been neglected."
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