But Dutch defender Loovens says it is vital the players sharpen up ahead of the double header against Dinamo.
In Group F , Galatasaray stayed on top on seven points with a 4-1 victory at home to Dinamo Bucuresti.
Celtic will have to overcome another big club, Dinamo Moscow, next Wednesday when the sides face in their Champions League qualifier.
Champions Barcelona were drawn in a tough Group F, with Italian champions Inter, Ukrainian champions Dinamo Kiev and Russian champions Rubin Kazan.
In the other match, Milan Badelj was the star of the show as Dinamo Zagreb cruised to a 3-0 victory at Romania's Timisoara.
Romanian side Dinamo Bucuresti won 1-0 away to Austria's Sturm Graz as defender Gabriel Tamas netted the only goal with 10 minutes to play.
Celtic host Moscow Dinamo on Champions League qualifying duty on 29 July and Fox, 23, will be able to feature in the crucial double header.
His comments follow the Jambos' Europa League exit at the hands of Dinamo Zagreb and Laszlo voicing his concerns at the lack of cash for transfers.
Their chances of repeating a third-place finish may depend on an against-the-odds victory over Dinamo Zagreb and the cash from qualifying for the Europa League group stage.
Arsenal boss Arsene Wenger left Reyes out of the Gunners' line-up for their Champions League qualifier second leg against Dinamo Zagreb but he denied it had anything to do with transfer speculation.
BBC: SPORT | Football | My Club | Arsenal | Arsenal turn down offer for Reyes
Celtic overcame Dinamo Moscow in the last qualifying round, having slipped to a 1-0 defeat at home in the first leg and Manchester City boss Mark Hughes was impressed by their 2-0 win in Russia.
Dinamo Zagreb midfielder Jerko Leko, who was called up earlier in the year before being sidelined with a broken rib, and defender Filip Tapalovic of TSV 1860 Munich are also in line for their first caps.
In Group A , Ajax Amsterdam went top on goal difference after beating Dinamo Zagreb 2-1, with Luis Suarez scoring a third-minute penalty and winger Dennis Rommedahl doubling the lead on 81 before Ivan Tomecak's late consolation.
As part of the preseason preparations for Scottish side Celtic, games were played in Australia and Wales, before a stop off at the Wembley Cup in London came before a crucial Champions League qualifier against Dinamo Moscow in Russia.
The lack of a competitive national league, and the money that goes with it, means that even great names like Dinamo Zagreb and Hajduk Split have struggled, as the best players head abroad for better pay and the big prizes.
The diagnosis of hypertension came only a week after he took over the Dynamo Kiev job after resigning from the Ukraine national team post and two days after his new team beat Dinamo Zagreb 2-0 on match-day 2 of the UEFA Champions League.
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