It is suspected that the Everton defender broke his ribs. He was forced to leave the Rose Bowl pitch after just 17 minutes.
"He's gone to the hospital to get an X-ray," said Giggs.
"He's gone to check that there's no real damage, maybe just a cracked rib.
"They're really painful. You breathe, you sneeze, you cough - it's agony. Fingers crossed he'll be okay because we want him fit and back for pre-season."