Palmer picked up an injury while training on the eve of Chelsea's Premier League clash against Arsenal and was left out of the Blues' squad by Maresca. The two-time European champions were unable to get the win at the Emirates without their starman as the Blues lulled to a 1-0 loss after Mikel Merino's 20th-minute strike.
Palmer's availability for Tuchel's first two matches as England boss in the World Cup qualifiers against Albania and Latvia is now under scrutiny. Maresca thinks the 22-year-old will have to withdraw from the squad, but the severity of his injury will only be revealed when he undergoes scans on Monday.
The FA have already confirmed that Morgan Gibbs-White has been added to Tuchel's squad, with the Nottingham Forest star set to take Palmer's place in the forward ranks.