The Daily Mail says Lampard was set to learn on Wednesday whether he would miss Chelsea's top-of-the-table Barclays Premier League showdown with Manchester United after he lasted just 15 minutes of their first serious defeat of the season.
Lampard limped out of Tuesday's 2-1 Champions League loss at Shakhtar Donetsk with a recurrence of the calf injury that ruled him out of England's World Cup qualifiers against San Marino and Poland and was set to undergo a scan to determine the extent of the problem.
Blues boss Roberto Di Matteo said: "It's basically a recurrence of an old injury.
"He was training with us fine and there were no alarm bells before the game. He was in good condition to play."