22nd May: Sunrisers v Rajasthan Royals, 14:30 GMT
24th-28th May: 2nd Test, Headingley
Left-arm quick Sidebottom picked up the injury, a grade one tear, during Nottinghamshire's six-wicket Friends Provident t20 victory over Worcestershire at Trent Bridge but he will remain with the squad where he will receive ongoing rehabilitation and assessment.
"It's a shame Ryan has picked up this injury as he's been injury-free for some time now and bowling well," national selector Geoff Miller commented.
"Thankfully it's a relatively minor injury and we look forward to him making a full recovery soon. Ajmal Shahzad is a strong addition to the squad and he'll no doubt be looking to build on his maiden ODI appearance for England in Bangladesh over the winter."
Shahzad also made his Test debut against Bangladesh during the recent second Test at Old Trafford, ironically at the expense of Sidebottom, who was called up to the squad but left out of the team.
Sidebottom was forced home from England's recent tour of Bangladesh and also missed matches during the 2009 tour of the West Indies, recovering to be a key part of England's success in the ICC World Twenty20 - where Shahzad was an unused squad member.
England take on Scotland on 19th June in Edinburgh before the ODI series against Australia begins on 22nd June at The Rose Bowl.
Shahzad has played one Test, one One-Day International and one Twenty20 International for his country.
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