Belgium coach Marc Wilmots played down concerns over Romelu Lukaku's ankle after the striker limped off against Tunisia on Saturday.
In Belgium's final friendly before the FIFA World Cup, Dries Mertens struck the winner in the 89th minute as the hosts triumphed 1-0 in Brussels.
Wilmots labelled the game 'weird', after it was suspended midway through the first half due to a severe hailstorm and did not restart for 45 minutes.
But the focus after the match was on Lukaku's right ankle, which appeared to be injured in a tackle from Tunisia's Bilel Mohsni.
Lukaku was brought off in second-half stoppage time but Wilmots claimed the Chelsea forward had suffered, at worst, a 'severe sprain' and should only miss three or four days of training.
"Romelu has problems walking," Belgium's coach said.
"His injury seems at first sight not too bad, the doctors told me.
"This is preliminary to a severe sprain but we will obviously do additional tests on Sunday.
"For the time being, Romelu will miss three to four days, hopefully it stops there."
Lukaku is expected to be Belgium's main striker in Brazil with the 21-year-old centre forward having scored four goals in his country's three lead-up games, on the back of 16 in all competitions on loan at Everton last season.
With Tunisia playing five men in defence, Belgium struggled to break through the visitors at the Stade Roi Baudouin, although Wilmots was pleased with his team's patience.
The 45-year-old coach had set up the friendly against Tunisia to prepare for Belgium's World Cup opener against Algeria but he claimed the Algerians would attack more in Belo Horizonte on June 17.
"It was hard to play (against a team) that remained with nine men behind the ball," Wilmots said.
"This was a very good test with an eye on the World Cup and Algeria, although that team has even more talent offensively."
Mertens was less positive about Belgium's performance, although he paid tribute to Nacer Chadli and Vincent Kompany for their passes, which created his goal.
"It was not a good match," Mertens said.
"We won 1-0 and that is ultimately what it's all about but we had to play faster.
"Scoring is always good. The pass from Chadli was tailor-made, like the first pass from Kompany."
|15||D. Van Buyten|
|Coach: M. Wilmots|
for M. Fellaini 46'
for T. Alderweireld 46'
for K. Mirallas 62'
for D. Origi 62'
for E. Hazard 74'
for R. Lukaku 90+2'
|Mourinho has ´got to grips´ with United - Ferguson|
|Uganda v Mali: A lot at stake for Mali in shot-shy showdown|
|Napoli 1 Fiorentina 0: Callejon heads Partenopei into semi-finals|
|Bordeaux 1 Paris Saint-Germain 4: Cavani, Di Maria secure final berth|
|Watzke: Dortmund would consider €80m for Aubameyang|
|Togo 1 DR Congo 3: Kabananga´s goal streak continues as Ibenge´s men top group|
|Morocco 1 Ivory Coast 0: Alioui stunner sends holders crashing out|
|Romeu earns Southampton extension as Puel targets away goal|
|Sunderland striker Anichebe out for up to 10 weeks|
|Elneny wants to be an Arsenal legend ´like Thierry Henry´|
|Corini leaves Palermo as Ballardini is tipped for fourth return|
|Hernandez leaves Leicester for Malaga|
|Lukas PodGOALski...Gala forward nets five amid J-League links|
|CAS rejects Serbian appeal against Kosovo UEFA membership|
|Thiago back in Bayern training as Arsenal showdown looms|
|Thiago back in Bayern training as Arsenal showdown looms|
|Shearer´s Toon Army ´trump´ the POTUS|
|Rooney´s record may stand forever - Ferguson|
|Carrick expects full-strength United as Wembley return beckons|
|They insulted his mother and then there were monkey noises - Cyprien on Bastia Balotelli abuse|
|No Chelsea regrets for Sampaoli as Sevilla mount title challenge|
|Egypt v Ghana: Cuper backs Elneny to deliver in crucial Group D clash|
|James adds to Zidane´s injury woes at Madrid|
|Zidane wants fans behind Madrid after latest Ronaldo whistles|
|Mason ´continues to make excellent progress´|
|Allegri slams ´stupidity´ surrounding Buffon referee hug|
|Niang in talks over AC Milan exit, confirms Montella|
|Sunderland sign Lescott|
|China-bound Ramos completes loan switch to Granada|
|Rahman to miss ´several months´|
|Leekens quits after Algeria´s AFCON exit|
|Jese has firm Premier League offer, claims Las Palmas president|
|´I´m blessed with golden genes´ - Adebayor insists he is ready for new Premier League chance|
|Messi renewal progressing ´very, very well´ - Robert|
|Neuer expects Clement success at Swansea|
|Klopp calls for Liverpool enjoyment|
|Mustafi talks up Arsenal belief|
|Van Basten still against offside, slams ´nonsense in the media´|
|Rakitic dreaming of career-long Barcelona stay|
|Toure inspired by Ibrahimovic as he explains Chinese Super League snub|
|Kasperczak committed to attacking approach as Tunisia reach AFCON quarters|
|Slimani wants Algeria youngsters to learn from AFCON humiliation|
|Senegal 2 Algeria 2: Slimani at the double as Desert Warriors bow out|
|Zimbabwe 2 Tunisia 4: First-half glut seals progression|
|Adrian: I always wanted to return to Villarreal|
|Togo v DR Congo: Agassa could miss crucial game after vandals hit home|
|Extended Southampton stay on the cards for Sims|
|Bayern hoping for speedy Vidal return|
|Hull sign Markovic on loan from Liverpool|
|Wenger charged with misconduct by FA|
|Deulofeu joins AC Milan - and this time the deal is definitely done!|
|Henderson still playing through pain, reveals Klopp|
|Record-breaking Rooney reveals secret to longevity|
|No ulterior motive behind Van Dijk captaincy call - Puel|
|Carroll ignoring want-away Payet|
|Gerrard´s managerial ambitions ´wonderful news for Liverpool´ - Klopp|
|PSG interested in Guedes, confirms Emery|
|Barca lose Busquets to sprained ankle|
|Pulisic commits to Dortmund until 2020|
|Mason speaking after suffering fractured skull|
|Aubameyang blames poor preparation for Gabon AFCON exit|
|David Beckham returns to PSG|
|Morocco v Ivory Coast: Holders must beat old boss Renard as group reaches thrilling conclusion|
|Djilobodji charged over Fletcher incident|
|Cahill and Terry visit Mason in hospital|
|Allardyce onto second-choice transfer targets|
|Dortmund sign teenager Isak|
|Madrid confirm Modric and Marcelo injury blows|
|Vidal fears longer lay-off, targets return against Arsenal|
|Yaya Toure: Sterling should have dived!|
|Turan wants to see out Barcelona contract despite China talk|
|Impassioned Ibrahimovic attacks Rooney´s critics|
|´He has to lose weight´ – Mihajlovic angry after dropping Maxi Lopez|
|Lack of Liverpool signings frustrates Klopp|
|Suarez: Busquets difficult to replace for Barca|
|Depay impresses Lyon after debut|
|CSL? Rooney committed to United|
|Denis Suarez wants more goals after opening Barca account|
|Simeone bemoans inconsistency but says Atletico are improving|
|Mourinho won´t stand in the way of Rooney and CSL|
|Dzeko on target as Roma stay on Juve´s tail|
|Rakitic ready to cover for injured Busquets|
|Bale and Kane wish Mason well after serious injury|
|Busquets injury less severe than feared - Luis Enrique|