San Diego Chargers wide receiver Keenan Allen suffered a hip flexor injury Sunday that will be tested on Monday, a source told ESPN's Adam Schefter.
Allen does not believe the injury to be serious, the source said.
He finished Sunday's 27-20 loss against the Green Bay Packers with 14 receptions for 157 yards but missed the entire fourth quarter due to his hip injury. He had 11 catches for 128 yards in the first half alone.