England have received another injury setback ahead of their Six Nations opener against France, with George Kruis hurting his knee in training on Tuesday.
Saracens lock Kruis - a consistently impressive performer under Eddie Jones - is among 25 players to have been retained for Saturday's clash with France at Twickenham.
However, the Rugby Football Union confirmed the 26-year-old faces a medical assessment on Wednesday "to determine the extent of a knee injury picked up in training".
England had been tipped to pair Kruis with Joe Launchbury in the second row against France, freeing up Maro Itoje to take the number six shirt in the absence of injured former skipper Chris Robshaw.
The 25-man squad announced on Tuesday included Joe Marler and James Haskell, who had both been injury doubts.