One in particular will be the striker's former club, Melbourne Victory, for whom the 32-year old scored 36 goals in 89 appearances and won two Championships.
This season, the Victory are experiencing a goal shortage with just 17 in 15 matches which is nowhere near enough to put them in the 'genuine title threat' category.
Look back to 2006/07, the season of the Victory's first triumph, when Allsopp won the A-League Golden Boot for scoring 11 goals in the regular season when the Victory netted 41 in 21 matches - nine more than their closest rivals.
Or the 2008/09 season, when Melbourne again took the Premiership/Championship double, largely due to Allsopp's 11 goals when they again topped the league with 39 from their 21 outings.
These stats suggest a common trend that when Allsopp is at the club, things are positive, goals are being scored and titles are being won.
Last season, Melbourne failed to win the title but were the heaviest scoring team in the league thanks to Costa Rican midfielder Carlos Hernandez and of course, Allsopp's partner in crime Archie Thompson, who did most of the damage.
But this season, with Hernandez seemingly strangled by opposition defences and Thompson coming back from a serious knee injury, Melbourne are struggling to come up with winning scores as they have slumped to sixth on the table and are now 15 points off league leaders Brisbane Roar.
Robbie Kruse was hitting his straps with five goals in nine starts before a thigh injury but Brazilian import Ricardinho is taking his time to adapt to Ernie Merrick's game plan and only showed glimpses of ability before succumbing to a knee problem.
If the Victory want to return to the heights of previous seasons, they will have to look at bringing in a tried and true goalscorer when the transfer window opens in January and what better way than to reunite the A-League's most lethal duo for the business end of their thus far toothless 2010/11 campaign.