Australia have added Tasmanian batsman Alex Doolan to their 14-man squad for next week's fifth and final Ashes Test match against England in Sydney.

The 28-year-old has been drafted in for Doug Bollinger as Shane Watson continues to struggle with an injury picked up in the eight-wicket win in Melbourne.

Meanwhile, Nathan Coulter-Nile and all-rounder James Faulkner keep their place in Darren Lehmann's squad.

"With some players still being assessed by our medical team after four demanding tests, we have decided to add Alex to ensure we have sufficient cover in our batting lineup should it be required," selector John Inverarity said in a statement.

"Alex is a talented player who came under strong consideration for selection ahead of The Ashes series after a string of solid performances in four-day cricket for Tasmania at the start of this season, but also after an excellent finish to last season and we feel those performances warrant his inclusion in the squad of 14 for Sydney."

Australia lead the series 4-0.