The goalkeeper is eager to get back to playing - and he will be eligible to play in the Scottish Cup.
The goalkeeper has become Robbie Neilson's first signing after he also returned to Tynecastle.
The 37-year-old has officially ended his six-year stay at Parkhead.
Top-flight sides had been able to train since June 11 but only in a physically-distanced manner.
SPFL secretary Iain Blair said they expect full participation in the lower two divisions and possibly the Betfred Cup.
The two clubs have launched court action against the SPFL in a bid to avert their relegations.
UEFA have confirmed details of the remaining matches in the competition.
The Scotland captain is an English league champion after Liverpool topped the table.
The clubs are taking action against the SPFL following relegation.
Steve Clarke hopes that SPFL league reconstruction can be revisited to find a solution for player development.
The Celtic midfielder is hopeful his side can have full backing as soon as possible.
Jim Goodwin wants another 'four or five' players after recruiting Reid and Alnwick.
The national team boss says the new schedule can put Scotland in a good place to defeat Israel.
The right-back has joined the Staggies after a spell in Bulgarian football.
Scottish football authorities looking at ways to get supporters in stadiums as lockdown restrictions continue to ease.
The Fir Park side are hopeful their manager will remain at the club despite interest.
The league body wants scope to deal with Covid-19 issues without calling 42-club votes.
The league has submitted their answer to the petition from the relegated sides.
The former Hearts striker is part of Callum Davidson's new backroom team.
The German manager thanked fans in a message on his Twitter account.