Oldham lost 2-0 to Chesterfield in their National League match at Boundary Park on Saturday.
Following the game, Hope was the victim of a 'vicious' assault that will now leave him on the sidelines for a number of weeks.
The club posted a statement on their website that read: "Oldham Athletic is sorry to have to report that our player, Hallam Hope, was the victim of a vicious assault on Saturday evening.
"The assault took place in the staff car park following the game against Chesterfield. Hallam sustained serious injuries which required hospital treatment and he will be out of action for some weeks.
"The matter has been reported to the Police and we have provided CCTV footage in relation to the incident.
"Whilst the investigation is continuing Oldham Athletic will make no further comment on the incident.
"The club is supporting Hallam and will continue to do so. We wish him a speedy recovery from a dreadful experience."
Oldham are currently 14th in the National League with eight points from their first seven games of the season.
Empoli 
Udinese 
CSKA Moscow 
Rubin 
Slovan Bratislava 
AC Milan 
Sparta Praha 
Atletico Madrid 
Valencia 
Barcelona 
Stade Brestois 29 
Bayer Leverkusen 
Red Bull Salzburg 
Bayern Munich 
Paris Saint Germain 
Inter 
RB Leipzig 
Manchester City 
Feyenoord 
Sporting CP 
Arsenal 
FC Rostov 
Spartak Moscow 
Aston Villa 
Juventus 
Celtic 
Club Brugge 
Dinamo Zagreb 
Borussia Dortmund 
Liverpool 
Real Madrid 
Monaco 
Benfica 
PSV 
Shakhtar Donetsk 
Lokomotiv Moscow 
Dinamo Moscow 
Anderlecht 
FC Porto 
AZ Alkmaar 
Galatasaray 
Dynamo Kyiv 
Viktoria Plzen 
Lazio 
Ludogorets 
Qarabag 
Lyon 
FC Heidenheim 
Chelsea 
FC Midtjylland 
Eintracht Frankfurt 
Manchester Utd 
Bodo/Glimt 
Nice 
Rangers 
Real Sociedad 
Ajax 
Tottenham 
Roma