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The 39-year-old has scored 14 goals in 22 appearances since re-joining the Rossoneri, including three at the start of the new seasonhaving beenawarded a contract extension in August.
His momentum was stalled by a positive coronavirus test in the build-up to theEuropa League qualifying meeting with Bodo/Glimt last month.
Ibrahimovic went straight into self-isolation, missing another European clash with Rio Ave as well as a Serie A fixture against Spezia, but he will be available for selection again after the international break.
AC Milan will be seeking to extend their perfect start to 2020-21 when they come up against local rivals Inter at San Siro on Saturday, with Vieri confident that a prized asset will be ready to make an impact.
The former Italy international, who had spells at both Milan clubs during his playing days, told Gazzetta Dello Sport of Ibrahimovic: “He will have broken the treadmill every day. One who says that coronavirus had a bad idea to challenge him, is mentally stronger than all.
“He’ll play the derby with a cigarette in his mouth, trust me.”
Vieri added on the impact the veteran centre-forward has had on Milan's squad over the past nine months:“His experience has no equal and encompasses everything.
"Technique, vision of the game, scoring goals, assisting and making his team play better. He raises everyone’s level of quality.”