But this new injury for Bellamy, who will definitely miss Wales' friendly with Georgia on 20 August, is a huge blow to club and country at the start of a new season.
"Craig really needs to play competitive games," said Toshack.
"He has gone almost a year without any competitive football which is very disappointing for us.
"Hamstring injuries normally need about four to six weeks to recover so whether he plays for us in our World Cup qualifiers is in the hands of West Ham."
Bellamy has vowed to bounce back from his injury that has robbed him from starting the new Premier League season.
"It's gutting for me not to be able to start the season, especially as I have had a great pre-season," said Bellamy.
"I wanted to hit the ground running and make an immediate impact."
Bellamy scored five pre-season goals and was relishing the start of the new campaign.
He picked up the injury soon after scoring in West Ham's 5-3 friendly win over Ipswich at Portman Road on Monday.
It means he will miss the games against Wigan, Manchester City and Blackburn but could be back for Alan Curbishley's side for the trip to West Brom on 13 September.
That also means a race against time for Wales' qualifiers.
Bellamy played only nine games for the Hammers last term in an injury-ravaged first season at Upton Park that was blighted by abdominal and groin problems.
But he said: "I have probably had the best pre-season ever and I think I have shown that I proved my point in that I totally recovered from my injury last year and have returned fitter and stronger like I said I would.
"But it won't affect me too much in terms of working through the rehabilitation for this injury and to get back better than before again."
Only last week, manager Curbishley praised the Welshman, who has been capped 51 times for his country, after scoring a brace in a 2-0 win over Peterborough.
"He has worked extremely hard to return to full fitness and is a great asset," stated Curbishley.
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