The 27-year-old Jamshed has played in two Tests, 48 one-day internationals and 18 Twenty20 matches for Pakistan. Both men were later bailed until April pending further inquiries. Jamshed is among three players who were recently suspended for violating a cricket anti-corruption code.
The Pakistan Cricket Board (PCB) also suspended Pakistan internationals Sharjeel Khan and Khalid Latif, who are due to appear in front of the board on Wednesday.
Jamshed has not commented on the allegations.
The spot-fixing allegations relate to the Pakistan Super League - the country's top-flight cricket championship which is held in the United Arab Emirates for security reasons.
Khan and Latif play in the Pakistan Super League for current champions Islamabad United.
The PCB previously said it was investigating "an international syndicate which is believed to be attempting to corrupt the PSL".
The next step for the PCB is to issue show cause notices to the suspended players and initiate a disciplinary inquiry into the breaches of the code. Any inquiry, in the shape of an independent tribunal, is likely to be headed by a retired High Court or Supreme Court judge.
"We had a lot of evidence on which we based our decision," Najam Sethi, the PSL chairman, said on his talk show on Geo TV, before the announcement of the arrests. "We know what we are doing. We have all evidence. We had this for a while, we had information - we cannot talk about stuff right now but a charge sheet will be given to players soon.
"We had definite information, and not just us, we were collecting it. We knew it was happening, we had identified a few players and then at final stages we knew the ICC had some information as well and when we compared it the information was the same, then we decided to act on this."
Sethi said the PCB investigation into alleged corruption had begun before the PSL's second season began.
"You will know in 3-4 days what the plans were, what they were going to do, we have these players' phones in which there is more information. Who they were in touch with, what they talked about, their text messages, WhatsApp messages.
"We had an idea this was happening. We had also infiltrated into Pakistani bookies and we had some information from there as well before we got here. The league was huge last year and we knew it would attract bookies. We were waiting for it and we knew some players outside the PSL would be involved in it.
"We suspended Nasir Jamshed as well, about whom we know what role he played. We nipped it in the bud."