Arsenal’s Aaron Ramsey ruled out for a month

Welsh midfielder picked up a hamstring injury in north London derby draw with Tottenham

Arsenal are resigned to being without Wales midfielder Aaron Ramsey for at least a month after scans confirmed the extent of his hamstring injury, but the club have at least been reassured that Jack Wilshere will be fit enough to feature against Premier League leaders Chelsea on Sunday.

Wilshere still has a slim chance of featuring in Wednesday's Champions League group game against Galatasaray at the Emirates Stadium despite turning his ankle under a challenge from Danny Rose during the north London derby on Saturday. That injury initially had the England midfielder writhing on the turf in agony, a worrying reaction given the player's recent history with ankle complaints. Indeed, while he recovered to play on, he was eventually forced off the pitch just after the hour mark to be replaced by Alexis Sanchez.

Yet, while the joint is still undergoing treatment, Arsenal are now confident the 22-year-old will be able to take part in the game at Stamford Bridge – when their unbeaten league record will be severely tested by the leaders – and may even be included among the substitutes when Arsene Wenger's side attempt to kickstart their European campaign against the Turkish team. Arsenal lost their opening fixture 2-0 at Borussia Dortmund a fortnight ago.

The prognosis on the other players who had to be substituted on Saturday was not as favourable, with Ramsey in particular to be missed. Scans confirmed that the Welshman, replaced at the end of the first period against Tottenham Hotspur, pulled his hamstring and has been ruled out of his country’s Euro 2016 qualifying games against Bosnia-Herzegovina and then Cyprus in Cardiff next month.

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Arsenal will treat the injury with caution given that Ramsey, such an influential player in this team, injured his thigh on Boxing Day last year. Wenger had initially been hopeful the player would return within three weeks given it was initially considered “only a little muscular injury” but Ramsey ended up sidelined for three months. Yet there is optimism within the hierarchy that his current hamstring complaint will not prove so prolonged.

Meanwhile, the calf strain suffered by Mikel Arteta early on in Saturday's game will rule him out for three weeks, though there is some relief that the Spaniard will be available again soon after the international window.

Midfield duties will most likely fall upon Mathieu Flamini and Alex Oxlade-Chamberlain against the Turks, with Francis Coquelin and Abou Diaby alternative options. Arsenal might have considered moving Calum Chambers into midfield but are stretched defensively at present, though Per Mertesacker should be available against both Galatasaray and Chelsea in anticipation of resting during the international break given his decision to retire from international football after the World Cup finals.