German forward Lukas Podolski has been ruled out of Monday's World Cup clash against Algeria in Porto Alegre with a thigh injury.

Podolski suffered the injury in Germany's 1-0 win over the USA on Thursday in their final group stage match and an MRI scan on Saturday revealed a small tear.

"Lukas must rest for two or three days, but should we progress in the tournament it won't be a problem for him to play," said Germany coach Joachim Low.

Germany's right-back Jerome Boateng also missed training on Saturday with a knee irritation, but Low said it would be "no problem" for the Bayern Munich defender to play.