The Dragons have lost their opening two GUINNESS PRO12 games, going down 16-11 to Connacht in their opener before slipping to an agonising 17-15 defeat against Welsh rivals Ospreys on Friday night.
Youngsters Jack Dixon and Tyler Morgan have deputised in the centres for Jones' men while Leach and Smith have been battling knee and foot injuries respectively.
And Jones admits that although the young pair have bags of talent, he would like to have the option to play a more experienced head alongside them.
At Rodney Parade on Friday, tries from Eli Walker and Wales international Rhys Webb were enough for Ospreys to edge the Dragons and Jones acknowledged that his team must cut out the errors in order to succeed.
"We turned the ball over with 16 handling errors and we did the same in Connacht," said Jones. "That's an area for us to work on.
"The young guys get excited. They have got great ability and are positive but this is big boy stuff and it's about picking the moments.
"The Ospreys didn't need to do anything fancy, they were just direct and that comes with experience with Alun Wyn Jones leading the forwards and Dan Biggar controlling from ten.
"We don't have any options at centre and I don't want that to sound like Jack and Tyler wouldn't be in the team, but Ashley and Pat give us experience and we'd probably like to have one of them in there.
"We were five metres away with a drop kick to beat the Ospreys and a disallowed try away from beating Connacht - it's a fine line and we have to stay positive."
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