Newcastle boss Eddie Howe admits they may seek a new striker signing over Callum Wilson injury concerns.
The striker complained of muscle tightness at half-time during Sunday's 3-3 draw with Manchester City and was withdrawn on 70 minutes.
The Magpies are currently in discussions over a deal for Watford forward Joao Pedro - the clubs remain apart on the fee - and Howe was asked on Tuesday if Wilson's injury could affect their transfer strategy.
"We will wait and see the extent of Callum's injury before answering that question," he said.
"I don't think it will be serious, but with hamstrings you have to be very careful. We will wait and see the results and see how long he's going to be out. We hope it's not too serious."