Coloccini withdrew from an Argentina training session on Wednesday, complaining of tightness in his right hamstring.
"If the manager wants to use the squad players for the Europa League, it's a chance for them to stake a claim for the Premier League," he told the Evening Chronicle.
"We all want to play in the Premier League, and these games are a chance to impress. If a player is given a chance, he's got to take it.
"We've got a big squad now, and that means competition for places."