England will wait nervously on Jason Roy and Tom Curran following the news the pair will be sidelined for Surrey's Royal London One-Day Cup fixture against Middlesex on Thursday.
The duo were named in England's preliminary 15-man squad for this summer's World Cup and are expected to link up with the group this week ahead of the forthcoming one-day internationals against Pakistan and Ireland.
However, Roy suffered a back spasm while batting against Essex, precluding him from fielding, while seam bowling all-rounder Curran was ruled out of Tuesday's win because of a low grade calf complaint.
Joe Denly, another batsman included in the World Cup party, also suffered a back problem on his return to Kent on Tuesday following a stint at the Indian Premier League.
The cumulative knocks could be a worry for England, with batsman Alex Hales missing Nottinghamshire's opening fixtures in the One-Day Cup because of "personal reasons".
While his World Cup is reported not to be in doubt, the fitness of pace bowlers Chris Woakes and Mark Wood may need managing in a hectic next few months because of long-standing injuries.
Woakes insisted earlier this month he has "turned a corner" following a couple of injections to his troublesome right knee but Wood has been conspicuous by his absence for Durham this season, heightening concerns over a left ankle that has been operated on three times.
Ben Stokes has missed a couple of games in the IPL but it has been reported his absences for the Rajasthan Royals were merely a precaution.
