His two most high-profile players are Yohan Benalouane at Parma in Italy and Denis Odoi at Belgian club Anderlecht.
Crespo was also reported to be keen on linking up with AC Milan boss Carlo Ancelotti, who coached him at Parma.
BBC: SPORT | Football | My Club | Chelsea | Crespo makes Chelsea pledge
In Italy , Juventus gave hope to Serie A's title hopefuls after dropping points in the 1-1 draw at Parma on Sunday.
Elsewhere, Udinese eased to a 3-0 win at Parma, while Palermo finished 1-1 against Bologna, Chievo finished goalless against Catania and Genoa drew 1-1 with Sampdoria.
In other action, Inter Milan's Champions League chances receded with a 3-1 loss at Parma which left the 2010 European titleholders three points behind Napoli and Udinese in the race for third place.
In other games, Atalanta won 3-1 at home to Parma, Lazio lost 2-0 at Bari and Cagliari continued early-season leaders Genoa's poor recent run with a 3-2 home win.
Livorno eased their fears of relegation with a hard-fought 2-1 victory over Parma at the Stadio Armando Picchi.
The Welsh region lost 15-24 at home to Overmach Parma to drop into the second tier Challenge Cup, but did make the semi-finals of the competition before losing to Clermont Auvergne.
In the late 1980s, researchers at the University of Parma in Italy found that the brain cells of macaque monkey fired in the same way whether they were making a particular motion (like reaching for a peanut) or watching another monkey or human make that movement.
Lazio and fellow strugglers Bologna were scoreless at the Stadio Olimpico in Rome while Nicola Amoruso's late penalty earned fifth-placed Parma a 1-1 draw at home to Napoli.
"According to the examinations carried out by doctor Andrea Ferretti as soon as the player arrived at the team's training camp at Coverciano, the muscular injury suffered by Vieri during the Inter-Parma match cannot heal in time for the player to take part in the European Championships, " the federation announced.
The Bianconeri squandered a two-goal lead as Napoli went one better than the come-from-behind midweek draw at AC Milan to climb to fifth in the table on goal difference above Parma.
Half an hour's drive away in Parma, Ohio's seventh-largest city, a rival operation was at work.
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