"Harrison has done well. And the two young props Genge and Kyle Sinckler.....I love them! They're going to be good those two boys.
"They're like two bowling balls - they're going to bowl some people over in the next five to six years. They're hungry and they want to be part of it."
Clifford has won all five of his previous caps as a replacement during the RBS 6 Nations and profits from Billy Vunipola's involvement in the Aviva Premiership final with Saracens.
"Jack has got everything in place. He's got athletic ability and pretty reasonable rugby sense," Jones said.
"What we need to see on Sunday is that hunger to really want to play for England. To give everything he's got - to come off the field with blood dripping off his face like James Haskell does every week.
"Now if we see that he's going to be a long term player for England because he's got it all."
- AAP