The combative midfielder has been sidelined with a major knee injury, which has caused him to in-effect miss five months of football.
He suffered the injury when on loan at Parma last season, and having been able to rest and recover well, he has now returned to full training and is expected to be fully fit in the next fortnight.
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According to Inter's official website, Mariga's progress has impressed the club officials who are keen to add his steel to their midfield. A statement read:
-Every day they edge closer to full fitness. Ricky Alvarez, Macdonald Mariga, Joel Obi, Andrea Romano and Dejan Stankovic are all keen to get back playing for Inter as they trained at the Centro Sportivo Angelo Moratti, it said.
Inter face Torino in the final match of the Italian Serie A weekend on Sunday 16 September 2012.