The 24-year-old required hospital treatment on Saturday after being knocked out and suffering a seizure minutes from the end of Hawick’s win over Currie.
And although he had pencilled in a comeback for next weekend’s Scottish Cup tie against Kelso, coach Derek Armstrong said the following week was a more realistic target.
That means the Greens will be without their key player for tomorrow’s showdown against Selkirk.
Cottrell, who has thanked everyone who helped him on the day and for all the messages of support, told the Hawick News: “I can’t remember anything about the end of the game or what happened. The first thing I remember is being in the ambulance and my dad told me the score.
“To be honest I felt bad because I wanted to be celebrating the win with the rest of the players.
“I feel fine now. Obviously I won’t be playing this week but I spoke with the doctor and he said I’ve to rest for two weeks so I’m looking at playing again next week.
“I’ll be going over to Selkirk on the bus with the players and I’ll be watching from the stand, although I’m confident they can get a good result.”
Injuries are nothing new for Cottrell, who can now add being knocked out to a broken collar bone, shoulder and ankle.
But he said it won’t stop him putting his body on the line in the future.
He added: “It’s part of the game. You can’t play rugby and not expect the odd injury and you can’t be scared when you’re my size.
“It’s just the way I’ve been brought up.
“My dad told me to take them by the legs and they won’t go anywhere.”
Deputising for Cottrell for the important Borders derby will be Bruce Campbell, who has turned in a succession of impressive performances for the YM this season.
And Greens coach Derek Armstrong has every confidence in him.
He said: “Bruce is a good player to come in and I have no problems there.”
A win for Hawick at Philiphaugh will cement their place in the top eight, although a Melrose victory over Stirling County would also see them secure in Premier Division One for another season.
But Armstrong said they wouldn’t be relying on anyone else.
He added: “We don’t want to be getting into the top eight by default, we want to get in on our own merits.”